RVStudy Guide for Chassis Specialty

Recreation Vehicle

Recreation Vehicle Industry Association SG

RVIA © 11/27/2011 i

Study Guide for the Certified RV Chassis Specialist Test

Compiled by the Recreation Vehicle Industry Association

Table of Contents Study Guide for the Certified RV Chassis Specialist Test .....................................1

Overview ...........................................................................................................1 What is an RV Service Technician? ..................................................................1 RVST Career Ladder.........................................................................................1 What You Must Know to Pass the Certified RV Chassis Specialist Test...........2 Resource list......................................................................................................3 Taking the test...................................................................................................3 RV Chassis Specialist Standards Chart ............................................................4 Sign-off Sheet Required Knowledge .................................................................8 Practice Questions ............................................................................................9

Chassis Practice Questions Answer Key .................................................23

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Study Guide for the Certified RV Chassis Specialist Test

Compiled by the Recreation Vehicle Industry Association

Overview The purpose of this Study Guide is to help the Recreation Vehicle (RV) Service Technician prepare to take and pass the RVIA/RVDA Certified RV Chassis Specialist Test. Note: The Certified RV Service Technician and Specialist is a Recreational Vehicle Industry designation. It does not constitute licensing or permission to perform any function or task controlled by state or local regulations. Technicians are required to meet all state and local requirements before performing any regulated tasks.

What is an RV Service Technician? Recreation vehicles have come a long way since the early days of the RV Industry, especially in the technical sense. So much so, it takes training, dedication and the command of specialized skills to become a successful RV service technician.

Today’s service technician must acquire and apply intelligent troubleshooting skills covering the vast amount of technical equipment found within a wide range of recreation vehicle types. In addition, a qualified RV service technician must be proficient with a variety of hand and powered tools and have the ability to read, understand, implement and install numerous accessories and add-on components common to the RVing lifestyle. Performing proper and complete preventive maintenance procedures is

yet another must-have skill the qualified service tech will master.

The reward is that, once the above is accomplished, a valued RV service technician will seldom (if ever), be without a job. To this day, there remains a remarkable shortage of qualified RV service technicians in the industry to staff not only traditional RV dealerships, but also those of stand-alone service shops and repair centers that are constantly seeking qualified individuals. There are many service technicians that open their own mobile RV repair business.

The bottom line is that all good RV service technicians will always have work, even during the toughest of economic times. It’s been proven; serious RVers will never entirely give up their lifestyle. They may take shorter, less frequent excursions, but even when fuel costs approach record highs, they will still be using that RV! And that’s the very reason it is an attractive option to become a professional RV service technician.

RVST Career Ladder The Service Technician Career Ladder was developed and launched through the combined efforts of the RV Dealer Association (RVDA), the RV Industry Association (RVIA) and the Certification Governing Board.

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Before the Career Ladder was established there was only one way to become a Certified RV Technician and that was to take and pass a comprehensive certification test. With the launch of the Career Ladder there are now two paths to certification. There is the traditional path through the existing RV Service Technician Certification Test and an alternate path through achieving Specialty Certifications.

The certification process begins with the Candidate level which provides a basic orientation to the RV Service Technician career. Next comes the Registered Technician level where the core knowledge of propane, basic electrical, and other skills are mastered. The technician can then move on to one of two paths. He can choose to take the comprehensive test which covers all subjects required for certification or master certification or he can choose to move through the individual specialties.

• Appliances • Body • Chassis • Electrical Systems • Plumbing

Once a technician holds all five Specialties, or passes the full certification test at the master level, and meets the time-in-service requirement he becomes a Master Certified RV Technician.

What You Must Know to Pass the Certified RV Chassis Specialist Test The curriculum for the Certified RV Chassis Specialist begins with the DACUM Chart Job and Task Analysis. This document outlines all the Duties, Tasks and Steps a Specialist is expected to know. The DACUM is also known as the RV Service Technician Standard and is further broken down to align with the levels of the RVST Career Path.

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This study guide is focused on the Chassis Specialist level of the Career Path.

The Chassis Specialist Chart lists all of the Duties, Tasks and Steps associated with the Chassis Specialist level.

Each section begins with the Duties, which will list the main topics covered. The Duties are followed by the activities a specialist must be able to perform in each area. This list was developed by working technicians, educators and subject matter experts from across the country and will provide a valuable check list of what to study for the test.

It should be noted that the number of questions in each area may not equal the number of tasks listed. Some of the tasks are complex and broad in scope and may be covered by several questions. Other tasks are simple and narrow in scope and one question may cover several tasks. The main objective in listing the tasks is to describe accurately what is done on the job, not to make each task correspond to a particular test question.

The Chassis Specialist Standards Chart begins on page 4.

Sample questions will follow. Although these same questions will not appear on actual tests, they are in the same format and cover the same topics as the actual test questions.

Resource list The following resources are available to help you prepare for the Chassis Specialist Test. The RVIA Textbooks and publications are available through the RVIA Store at www.rvia.org.

Brakes, Suspension and Towing – RVIA Textbook

Hydraulics – RVIA Textbook

Taking the test Get plenty of rest the night before so you will be alert and efficient. Arrive early enough to find the building and testing room. Be sure to bring your test center admission ticket and current photo I.D. The proctor will instruct you in filling out the answer booklet if taking the written test or how to log on to the computer if you are taking the on-line test.

Once testing has begun, keep track of time Do not spend too long on any single question. Be sure to read each question carefully so you understand exactly what is being asked. Do not mark answers in the test booklet if taking the written test; they must be marked on the answer sheet. Your test will not be scored if your answers are not on the answer sheet.

If a question is difficult, mark the answer that you think is correct and put a check by it in the test booklet. (Computer-based tests allow you to do this on screen.) Then go on to the next question. If you finish before time is up, you may go back to the question that you have checked.

It is to your advantage to answer every question. Do not leave any answers blank. Your score will be based only on the number of correct answers you give.

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RV Chassis Specialist Standards Chart E. BRAKE, SUSPENSION AND TOWING SYSTEMS 22 Inspect/maintain/repair the electrical braking system a Verify/measure proper voltage/amperage b Inspect wiring, routing and connections c Inspect/replace breakaway switch and battery

d Inspect/replace/machine drums and rotors; inspect/remove/replace armature

e Inspect/replace shoes and pads f Adjust brake shoes g Inspect spindles h Inspect and repack or replace wheel bearing sets and replace seal i Inspect/test/replace magnet j Repair/replace spring assemblies, actuator arm k Reinstall drum, torque wheel bearings (tighten spindle nut to torque spec) l Remove and reinstall dust cover m Install wheel n Install torque studs and/or lug nuts to mfg. specifications 24 Inspect/maintain/repair hydraulic surge brake systems a Inspect/repair/replace actuator b Inspect/repair/replace master cylinder and supply lines

c Inspect/replace/machine drums and rotors; inspect/remove/replace armature

d Inspect/replace shoes and pads e Inspect spindles f Inspect and repack or replace bearing set and replace seal g Inspect/repair/replace wheel cylinders h Repair/replace spring assemblies, actuator arm i Reinstall drum, torque wheel bearings (tighten spindle nut to torque spec) j Remove and reinstall dust cover k Install wheel l Install torque studs and/or lug nuts to mfg. specifications m Add brake fluids and bleed system n Adjust brake shoes o Flush hydraulic brake system p Inspect brake-away switch/device 25 Inspect/maintain/repair mechanical towing components a Verify ball hitch component weight ratings (i.e., class I, II, III, IV, V) b Install/repair/replace receiver hitches c Install/repair replace 5th wheel hitches/frame attachment d Determine compatibility of 5th wheel weight and hitch capacity e Determine ball/shank size and capacity f Determine hitch height/5th wheel pin height g Inspect/maintain/repair sway control systems h Inspect/maintain/repair weight distribution systems i Repair/replace couplers and safety chains/cables per state's standards j Verify hitch compatibility with trailer frame and hitch weight k Identify hitch types

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--weight bearing --weight distribution or equalizing --5th wheel --goose neck --tow bars (A-frame, adjustable, etc.) --tow dollies l Verify vehicle towing capacity m Wire electrical connections --left and right turn --brake control --brake light --running lights (tail, clearance, etc.) --back up lights --charge line --specialty connections m Wire vehicle (diodes vs. bulb and socket) for 2 and 4 wheel down towing o Install add-on brake systems for 4 wheel down towing 26 Inspect/maintain/repair air suspension system (RV mfg./dealer add on) a Verify unit and axle weights and capacities b Verify component ratings and capacities c Perform leak testing d Inspect/replace air tanks, lines, valves, air bags, air dryer, and fittings e Inspect/repair/replace compressor f Inspect/replace/adjust height control valve g Inspect/repair/replace axle and align h Install and adjust air bag kits

27 Inspect/maintain/repair mechanical steel suspension systems (RV mfg./dealer add on)

a Install and adjust helper springs b Verify unit weight/spring capacity c Measure and level coach d Inspect/replace shock absorbers e Inspect/replace springs f Inspect/replace U-bolts g Torque to specs h Inspect and align axle(s); confirm alignment i Inspect and replace shackles, shackle bolts, equalizer and bushings

28 Inspect/maintain/repair mechanical rubber suspension systems (RV mfg./dealer add on)

a Verify unit weight/spring capacity b Measure frame height and level coach c Inspect/replace shock absorbers and brackets d Inspect/replace rubber springs e Inspect/replace U-bolts, rubber bushings, etc. per mfg. specs --torque to specs --adjust tracking bar f Inspect and align axle(s); confirm alignment 29 Inspect/maintain/repair trailer suspension systems (steel spring) a Verify unit weight/spring capacity

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b Inspect/replace shock absorbers and brackets c Inspect/replace springs

d Inspect/replace shackles, shackle bolts, bushing, rockers/equalizers, and hangers

--torque to specs e Inspect/replace U-bolts and axle beam f Inspect and align axle(s); confirm alignment

30 Inspect/maintain/repair trailer suspension systems (rubber torsion axle)

a Verify unit weight vs. axle capacity b Inspect and torque mountings --torque fasteners to specs c Inspect and align axle(s); confirm alignment

31 Inspect/maintain/repair tongue, 5th wheel, truck camper and stabilizer jacks

a Lubricate and adjust components --gear box and gears --cross over arm and linkage

b Diagnose and repair electrical and hydraulic jacks, stabilizers and components

--motors --switches --wiring --hydraulic components c Diagnose and repair mechanical type jacks and stabilizers d Verify jack weight capacity vs. actual unit weight 32 Maintain/change wheels and tires a Verify weight and application specification b Match rim and tire for compatibility and application c Check tire pressure using load inflation pressure chart

d Check tire age, wear and condition including depth of cracks and manufacturing date

e Inspect tire wear to diagnose problem --inspect axle for camber --measure toe-in/out --measure tire pressure f Balance and rotate tires g Inspect/replace wheel/rim, studs and nuts, and hub condition --inspect wheel for cracked and distorted lug nut holes

h Verify and torque lug nuts or lug bolts in proper sequence and to mfg. specifications

i Inspect tires for date 33 Inspect/install/adjust/repair steering stabilizer systems a Verify unit weight b Verify proper part vs. chassis c Confirm proper bolt torque specification d Confirm 12VDC when applicable e Adjust alignment f Road test unit g Replace springs

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h Replace steering stabilizer

H. HYDRAULIC SYSTEMS 56 Inspect/maintain/repair hydraulic systems a Verify source voltage to pump --load --no load --proper ground connection b Verify fluid level in reservoir c Check integrity of hoses and routing and fittings d Diagnose/repair/replace components: --pump --solenoid valve assembly --switches and controls --hoses and fittings --actuators --manifold --printed circuit boards --hydraulic cylinders --wiring and wire harnesses and connectors --level sensor/jack sensor --equalizing (proportioning) valve e Perform preventive maintenance on cylinders --clean --lubricate --paint f Check for contamination of hydraulic fluids --use appropriate fluid

K. SLIDEOUT ROOM SYSTEMS 66 Inspect/maintain/repair slideout room hydraulic assembly a Verify source voltage to pump --load --no load --proper ground connection b Verify fluid level in reservoir c Check integrity of hoses and routing and fittings d Diagnose/repair/replace components: --pump --solenoid valve assembly --switches and controls --hoses and fittings --actuators --manifold --printed circuit boards --ram assembly --proportioning valve e Clean and lubricate seals

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67 Repair/adjust slideout room electrical and manual drive mechanisms a Repair/adjust electric mechanisms --cable driven (including cable and pulley systems) --gear driven --chain driven --screw driven --single motor --multi motor --rack and pinion b Repair/adjust manual mechanisms --manual crank systems --hand extension (push out) --tip outs 68 Install/replace/repair/adjust slideout accessory components a Replace and refasten seals --interior --exterior --sweep b Repair/adjust locking and interlocking mechanisms --lock out engine mechanisms --travel locks --drivers seat interlock --storage compartment interlocks c Install/repair/adjust slideout room awnings d Inspect/repair/replace utility connections between slideout room and coach --drain lines --fresh water lines --propane lines --AC and DC lines --communication lines (telephone) --coaxial cable, speaker wiring, and other entertainment systems e Adjust slideout room --height --front/rear clearances --alignment (front/rear skew) and travel limits

L. TECHNICAL SKILLS 70 Install accessories (interior and exterior) d Identify clearances and slideout room openings

Sign-off Sheet Required Knowledge There are no sign-off sheets associated with the Chassis Specialist. The 14 sign-off sheets for all other specialties can be downloaded from the RV Learning Center’s web site, www.rvlearningcenter.com.

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Practice Questions 01. The most common cause of brake magnet uneven surface wear is

A. damaged wheel bearings. B. worn magnet lever arm bushings. C. loose spindle nut. D. armature profile out of spec.

02. On drop-axles

A. the brakes cannot be adjusted. B. the brakes are auto-adjusting C. they are only used on trailers with no brakes D. a special tool is required to adjust the brakes.

03. When referring to trailer brakes, modulation means?

A. The frequency of the drum vibration during rotation. B. A term related to the control feedback system used in trailer anti-lock braking systems. C. The increase in voltage as the brakes are applied. D. Describes the motion of the trailer in the case of mis-adjusted brakes.

04. The boiling point of water is

A. lower than that of brake fluid. B. higher than that of brake fluid. C. the same as that of brake fluid. D. not relevant to hydraulic trailer brake operation.

05. Brake shoes should be replaced

A. at all wheel positions on all axles. B. when worn within 1/32” of the rivets. C. every 2 years. D. only at the wheels where excessive wear is present.

06. Hydraulic trailer brakes work by

A. pressurizing the brake fluid at the slave cylinder. B. compressing the brake fluid at the slave cylinder. C. utilizing the tow vehicle hydraulic brake system. D. translation of energy from hydraulic to electric.

07. Surge brakes involve which type of energy transformation?

A. Electric to hydraulic. B. Hydraulic to electric. C. Energy transformation is not involved in surge brakes. D. Mechanical to hydraulic.

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08. Surge brakes

A. utilize the tow vehicle hydraulic system. B. require a hydraulic reservoir on the trailer. C. require no hydraulic system. D. must be used with drum brake system.

09. A customer complains that his trailer, which is within the weight rating of the tow vehicle, pulls to one side upon braking. The technician should

A. adjust the surge brake actuator. B. tell the customer to distribute the weight in the trailer. C. adjust the brake shoes. D. adjust the tow vehicle ball mount height.

10. The total current draw from the brakes of a tri-axle trailer is approximately

A. 20A. B. 3A. C. 12V. D. 40A.

11. What is the ball size required for a Class V hitch?

A. 2” B. 2-1/4” C. 2-5/16” D. Ball size varies with application.

12. What is the recommended clearance between a pickup bed and a fifth-wheel pin box?

A. 3” B. 5-1/2” C. 8” D. No recommended clearance.

13. Which of these is not part of an air suspension system?

A. Solenoid valve. B. Pressure switch. C. Height control valve. D. Air accumulator tank.

14. What is the primary weakness of air suspension systems?

A. They are prone to puncture. B. They lack lateral stability. C. They result in a slightly harder ride than springs. D. They require periodic inflation from an external source.

15. The height control valve has direct control over what device?

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A. Spring dump valve. B. Air accumulator tank. C. Leaf spring limit switch. D. Air compressor.

16. What is the main advantage of rubber motorhome suspension systems?

A. Improves ride characteristics. B. Reduces spring bolt fatigue. C. Reduces shock fatigue. D. Eliminates leaf spring.

17. Why is it important not to use petroleum based lubricants on spring-eye bushings?

A. It causes the bushing to slip out of the spring eye. B. It breaks down the bushing material. C. The bushings should be installed dry. D. It causes the bushing to expand.

18. What is the main cause of tire cupping?

A. Wheel out of balance. B. Under-inflation. C. Wheel lockup and tire skidding. D. Overloading.

19. Rubber trailer springs operate on the principle of:

A. Torsion. B. Tension. C. Shear. D. Compression.

20. Rubber motorhome suspension systems replace which component on a standard spring suspension?

A. Leaf spring B. Spring shackle C. U-bolt D. Front eye bushing

21. If a single leaf in a leaf spring system breaks:

A. The entire leaf assembly must be replaced as a unit B. Both springs on the axle must be replaced due to fatigue C. An axle alignment must also be performed D. The spring assembly must be taken to a shop for proper leaf sizing and repair

22. Suspension systems should be visually inspected:

A. Every 6,000 miles B. Every year

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C. Every 2 years D. Every 5,000 miles

23. Rubber torsion axles require periodic inspection of :

A. Spindles B. Rotation shaft C. Axle bolts D. Fasteners

24. What is a fundamental problem with rubber torsion axles?

A. They can sag over time, requiring replacement B. The mounting bolts require periodic re-torqueing C. They require anti-sway systems D. They can only be used with surge brakes

25. The torsion arm:

A. Is attached to the axle tube B. Is attached to the spindle C. Is connected to the springs D. Can be repaired

26. Rubber torsion axles:

A. work in conjunction with leaf springs B. Don’t provide independent suspension C. are completely self-contained D. Require regular maintenance

27. Tongue jacks:

A. can be used to level a trailer B. Are available only in top-crank configurations C. Must not be operated with a dolly wheel in place D. Are available in only one weight rating

28. Stabilizer jacks:

A. Can be used to level a trailer B. Can be found on any RV type C. Should never be used in conjunction with levelling ramps D. Are always bolted to the RV frame

29. Following wheel replacement, wheel nuts/bolts should be tightened:

A. With an impact wrench only B. Initially, then not before 100 miles C. To 110 ft.-lbs. D. Initially, then after 50 miles

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30. Optimal tire inflation pressure:

A. Can be determined by weighing the vehicle B. Is stamped on the tire C. Is written on the Federal Certification Label D. Should always be determined with the tire warm

31. Tire side-wear is generally caused by:

A. Under inflation B. Out of balance C. Incorrect toe-in D. Overloading

32. Tires out of balance generally causes:

A. Side wear B. Toe wear C. Edge wear D. Cupping

33. Many motorhomes suffer from poor handling because:

A. Poor chassis construction B. They require front end alignment C. Size combined with steering geometry D. They require new tires

34. Motorhomes have not benefited from the same stability advancements as automobiles because:

A. Unfavorable load-to-height ratio B. Unfavorable load-to-tire width ratio C. Unfavorable weight-to-height ratio D. Driver fatigue causes this misconception

35. Which of these statements is false?

A. Steering stabilizers reduce driver fatigue B. Steering problems may involve the rear end components C. Steering stabilizers can be used to resolve other steering problems D. All steering stabilizers use bolt-on mounting

36. Which of these statements is true in relation to hydraulic systems?

A. Cavitation cannot occur as long as there is fluid in the system B. Pumps do not create pressure C. Pressure must be regulated to avoid excess work being performed by moving actuators D. The retract port is always located at the piston end of the cylinder

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37. What device is shown?

A. Fixed displacement pump B. Motor C. Expansion valve D. Pressure regulator

38. If a hydraulic line must be routed near a heat source, a shield must be installed. The main requirement of the shield is:

A. It must be made of steel B. It should be nominally 0.035 sheet C. It must conform to SAE standards D. Should be nominally 1/16” thick

39. During vehicle storage, hydraulic components should be activated and cycled:

A. Every 3 months B. Every 2 weeks C. Monthly D. No requirement to cycle the hydraulics while RV is in storage

40. Which step is generally not performed when verifying an internal leak of a dual acting cylinder

A. Loosen extend hose B. Operate hydraulic pump C. Retract all jacks D. Loosen retract hose

41. What controls fluid flow inside a solenoid valve?

A. Spool B. Shuttle valve C. Armature D. Needle valve

42. A directional control valve is also known as:

A. Flow control valve B. Check valve

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C. Selector valve D. PSI switch

43. What is a possible outcome of an internal leak in a hydraulic jack?

A. Jack extends while driving B. Loss of steering C. Hydraulic fluid in engine oil D. Slide room misalignment

44. The most common method of assembling the high pressure hydraulic hoses and fittings used in RV systems is:

A. barbed fittings B. crimping C. flared D. swaging

45. Besides filling the reservoir, the first thing that should be done before bleeding the hydraulic system is:

A. retract all cylinders B. extend all cylinders C. disconnect the battery D. loosen the extend hoses

46. Which personal protection equipment (PPE) is not specifically required when working on hydraulic equipment?

A. hearing protection B. Eye protection C. Safety gloves D. Face shield

47. Improper DC voltage can cause

A. One cylinder will not remain retracted B. Room extension creep C. Slow cylinder movement D. solenoid lockup

48. What is not a function of a spool valve:

A. connects and disconnects internal passages B. Auto-bleed of hydraulic system C. controls direction of a cylinder D. locks cylinders in the extend or retract position

49. What makes a power pack different from most hydraulic systems?

A. The cylinders are plumbed in parallel

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B. A power pack is used in the electrical system, not the hydraulic system C. It uses the vehicle hydraulic fluid instead of a dedicated reservoir D. The cylinders are plumbed in series

50. Which of the following is not a likely cause of a single hydraulic cylinder failing to retract?

A. Improper DC voltage at solenoid B. Defective solenoid C. Defective retraction spring D. Directional flow control valve blocked

51. During periods of RV storage or inactivity, it is recommended to:

A. Remove the hydraulic fluid reservoir cap B. Wipe the oil off extended cylinders C. Drain the hydraulic reservoir D. Not cycle the hydraulic cylinders

52. What is a tell-tale sign that the hydraulic fluid is low

A. Low fluid indicator activates B. Pump increases in pitch C. cylinders automatically retract D. pump will not run

53. Assuming that a hydraulic slide room draws 60A, what is the power output of the pump motor?

A. 5 Watts B. 5 HP C. 0.2 ohms D. 720 Watts

54. Which one is not part of a double-acting cylinder?

A. Seal gland B. Can C. Ram D. O-ring

55. Cleaning brake systems requires the use of a brake vacuum or brake cleaning solvent because some brake linings contain _____, which has been determined to be harmful to your health.

A. dirt B. asbestos C. grease D. sodium

56. Which component is NOT a part of a typical electrical trailer drum brake assembly?

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A. Slave cylinder. B. Magnet assembly. C. Adjuster screw assembly. D. Brake shoes

57. Armature surfaces can be milled but no more than _____ of material can be removed, although many drum manufactures recommend replacement.

A. 3" B. .3" C. .03" D. .003"

58. Wheel bearing grease should be replaced every ____ miles or _____months.

A. 1200/12 B. 12,000/12 C. 24,000/24 D. 36,000/12

59. A pulse preventer is a _____.

A. relay B. capacitor C. diode D. switch

60. A single electromagnet for 7" to 12" trailer brake assemblies should have approximately _______ resistance.

A. 3-4 ohms B. 12 ohms C. 6-8 ohms D. 03-.04 ohms

61. Electric trailer brakes are designed to operate on______.

A. 12VDC B. 24VDC C. 120VAC D. 6VDC

62. Checking the electromagnet for proper wear will involve the use of a______ .

A. straight edge B. VOM meter C. rasp D. sight gauge

63. The breakaway switch must be mounted in ______.

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A. the tow vehicle engine compartment. B. a swivel configuration. C. a protective compartment. D. compliance to the national transportation safety code.

64. The height control valves of a rear axle air suspension system ______.

A. monitor frame to axle distance. B. regulate air compressor resistance. C. are non adjustable. D. monitor air compressor faults.

65. Rubber torsion trailer suspension systems are required to be periodically______ for safety.

A. inspected B. replaced C. milled D. disassembled

66. The first step for working safely on a suspected damaged suspension system is to ______.

A. road test B. relieve the load on the suspension system C. Crawl under the unit for a visual inspection D. increase the load on the suspension

67. Trunnion bars are a component of a ______.

A. weight distribution hitch B. load carrying hitch C. Gooseneck hitch D. 5th Wheel hitch

68. What class of weight carrying hitch is rated for up to 15, 000 pounds?

A. Class II. B. Class III. C. Class IV. D. Class V.

69. Trailer running lights are ______.

A. mandated by Federal Regulations (FMVSS 108) B. mandated by NFPA 1192 C. not required D. National Electrical Code

70. The Weight Rating of a tow vehicle is located ______.

A. in the trunk B. passenger side door jam C. driver side door post or Jam

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D. in the glove box

71. A 1,000 pound rated hitch, mounted to a tow vehicle that has a 600 pound towing capacity, used with a 500 pound rated tow ball has total weight towing capacity of______?

A. 1,000 pounds B. 600 pounds C. 1500 pounds D. 500 pounds

72. On a tire that is embossed with LT235/85R16, the numbers 85 indicates the ______.

A. manufactured date B. height to width ratio C. load capacity D. wheel diameter

73. The average life expectancy of a trailer tire is ______.

A. 5-7 Years B. 3-4 Years C. 10-20 Years D. unlimited

74. A force of 90 pounds applied to the end of wrench one foot long will yield ______.

A. 30 foot pounds of torque B. 60 foot pounds of torque C. 90 foot pounds of torque D. 120 foot pounds of torque

75. Tire air pressure should be checked when the tire is ______.

A. cold B. hot C. hot or cold D. without a load

76. Brake fluid should be changed ________ .

A. every 5 years B. every 2-3 years C. every 6 months D. never

77. Brake fluid should be checked at least once every _______ months.

A. 6 B. 12 C. 19 D. 24

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78. Hydraulic electric brakes have not been manufactured since _______.

A. 1975 B. 1982 C. 1998 D. 2001

79. Manual brakes should be adjusted ______.

A. after the first 200 miles of operation. B. at 3,000 mile intervals. C. as use and performance requires. D. All of the above.

80. Stabilizer jacks are placed in contact with the ground and tightened to_______________.

A. raise the RV for service work. B. keep the RV from rocking. C. level the RV when on sloping terrain. D. assist with tire changing and or replacement.

81. Trouble shooting manual landing gear jacks does not involve__________.

A. checking for proper alignment. B. inspecting for signs of metal fatigue. C. lubricating bevel gears and other moving parts. D. load testing.

82. Cavitation in a hydraulic pump is likely an indication of ______.

A. low hydraulic fluid level. B. excessive pump pressure. C. low pump pressure. D. a defective controller valve.

83. The device that converts hydraulic power to mechanical power is called the ______.

A. reservoir B. pump C. actuator D. valve

84. Hydraulic power is regulated by?

A. Reservoirs. B. Pumps. C. Actuators. D. Valves.

85. ___________are used to contain excess fluid from system volume changes.

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A. Reservoirs B. Pumps C. Actuators D. Valves

86. ___________are used to replace hydraulic fluid through system leakage.

A. Reservoirs B. Pumps C. Actuators D. Valves

87. ___________are used to help separate dirt and air from hydraulic fluid.

A. Reservoirs B. Pumps C. Actuators D. Valves

88. Hydraulic hoses are generally designed and built to _________ standards.

A. ASE B. UL C. ANSI D. SAE

89. The typical type of pump used in RV applications is a _________ pump.

A. vane B. gear C. piston D. static

90. In a dual-acting hydraulic system, the hydraulic line going from the control valve back to the reservoir is called a ______.

A. working line B. pressure line C. return line D. supply line

91. In a dual-acting hydraulic system, the hydraulic line going from the pump to the control valve is called a ______.

A. working line B. pressure line C. return line D. supply line

92. Hydraulic hoses must be _________ away from any heat source unless protected by an adequate heat shield.

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A. 9 inches B. 18 Inches C. 3 Feet D. 6 Feet

93. During periods of storage or inactivity, the hydraulic system should be activated and cycled through the extending/retracting procedures ______.

A. weekly B. monthly C. seasonally D. semi-annually

94. To check the hydraulic fluid level in the reservoir you must first ensure the actuators are in the________ position.

A. extended B. partially extended C. retracted D. locked

95. One actuator/cylinder will not extend or retract. Which of the following would not normally be a cause of this condition?

A. Improper 12 VDC voltage at the solenoid. B. Bent or restricted cylinder. C. Low fluid level. D. Thermal expansion.

96. One actuator/cylinder will not remain extended. Which of the following could cause this condition?

A. Thermal expansion. B. Internal Leakage. C. Improper 12 VDC voltage at the solenoid. D. Bent or restricted actuator/cylinder.

97. An actuator/cylinder creeps out. Which of the following could cause this condition?

A. Defective retraction spring. B. Low fluid level. C. Kinked or restricted hose. D. Thermal expansion.

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Chassis Practice Questions Answer Key 001. B 026. C 051. A 076. B 002. D 027. A 052. B 077. A 003. C 028. B 053. D 078. C 004. A 029. D 054. C 079. D 005. B 030. A 055. B 080. B 006. A 031. D 056. A 081. D 007. D 032. D 057. C 082. A 008. B 033. C 058. B 083. C 009. C 034. B 059. C 084. D 010. A 035. C 060. A 085. A 011. C 036. B 061. A 086. A 012. B 037. A 062. A 087. A 013. A 038. B 063. B 088. D 014. B 039. C 064. A 089. B 015. D 040. D 065. A 090. C 016. A 041. A 066. B 091. B 017. D 042. C 067. A 092. B 018. A 043. A 068. D 093. B 019. C 044. D 069. A 094. C 020. B 045. A 070. C 095. D 021. D 046. A 071. D 096. B 022. A 047. C 072. B 097. D 023. D 048. B 073. A 024. A 049. D 074. C 025. B 050. D 075. A

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