OW-O-770

OOwwaattoonnnnaaOperator’s Manual

770Wheel Loader

THIS IS A MANUAL PRODUCED BY JENSALES INC. WITHOUT THE AUTHORIZATION OF OWATONNA OR IT’S SUCCESSORS. OWATONNA AND IT’S SUCCESSORS

ARE NOT RESPONSIBLE FOR THE QUALITY OR ACCURACY OF THIS MANUAL.

TRADE MARKS AND TRADE NAMES CONTAINED AND USED HEREIN ARE THOSE OF OTHERS, AND ARE USED HERE IN A DESCRIPTIVE SENSE TO REFER TO THE PRODUCTS OF OTHERS.

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OMC 770 This manual contains information needed to service and operate your loader. Included are instructions for operating, lubricating, and servicing. Read this manual, follow the instructions provided and refer to it for information when needed.

DEALER SERVICES

Your OMC Industrial dealer offers complete service. His personnel are factory trained in servicing OMC loaders.

Several of the detailed periodic services recommended in this manual require dealer assistance. Consult him at these intervals and at other times during the year to keep your loader in top notch operating condition.

When the term "right" or "left", "front" or "rear" are used, they are determined from a posi­tion sitting in the operator's seat looking forward.

OWATONNA MANUFACTURING CO., INC. OWATONNA, MINNESOTA

II

[Use OMC Repair Parts I

If service and repairs are needed, see your OMC OWATONNA DEALER and always insist on GENUINE OMC PARTS, in order to receive the highest in quality and service. When orde"r­ing parts from your OMC dealer or writing for further information, please include, your name, address, OMC dealer name, address,and serial number, model and date purchased.

DATE OF PURCHASE _________ _

DEALER NAME & ADDRESS

Loader Serial # Hydrostat Motor Unit # ______ _

Front Differential Serial # ______ _ Hydrostat Pump Unit #

Rear Differential Serial # Engine Serial #

Dropbox Serial # __________ _

Parts design subject to change without notice.

Controls and Instruments

OPERATION

Engine Driving Towing Tire Pressure Lights Boom, Buckets and Accessories Operating Tips Safety Rules Fuels and Lubricants Lubrication and Service Intervals Service Chart

DETAILED SERVICES

Air Cleaner Parking Brake Engine Crank Case Frame Hinge Pivots Steering Cylinders Boom and Buckets Cylinders Loader Hydraulics Radiator Fuel Pump Batteries Drive Shafts Alternator Differentals and Drop Box Loader Oil and Reservior Storage

SERVICE

Loader Boom - Hood - Grill and Instruments Hydrostatic Units Cooling System Electrical System Starter Hydraulic Valves Wiring Diagrams Hydraulic Gear Pump Brake and Wheel Adjustments

TROUBLE SHOOTING

2-3 4 5 6 7 8-9 10 1 12 - 13 14 15 - 16

17 - 20 - 24 17 -18 - 21 - 22 18 18 - 21 18 - 19 20 - 23 - 24 20 20-23 21 21 - 22 21 23 - 24 23 25

26 26 27 28 29 29 30 - 31 32 - 33 - 34 35

36 - 37 - 38

Since 1865

OWATONNA

MANUFACTURING CO., INC.

OWATONNA, MINNESOTA III

HYDROSTATIC DRIVE SYSTEM - HYDRAULIC CIRCUIT

=-CQNTROL PRESSURE ~~ CHECK PORTS

~--~r------- -- __ _ ____ _ -- - -------. "B'I lIN" IIA'I

OIL COOLER

<!> HYDROSTATIC

PUMP

PORT "A"

PORT "8"

L----r----f---l'-- -- - __ +-_____ , __ ---__ ----I GATE VALVE

C.HARGE PRESSURE CtfECK TEE -. X----....

CONTROL PRESSURE CHECK DORTS

10 MICRON FILTER

L.!..J RE"SERVOIR

fVACUUM GAUGE

HIGH PRESSURE CI-tECK PORT

~~----1f----- - - ----- -- -- ---t--,

1-----+ ___ ..l

PORT "A"

CHARGE PRESSUR E ~-------+--* Cf+ E C. K PORT

HYDROSTATIC MOTOR

1 RESERVOIR

r-- ~_~ ____ ~~ _______ .-~~P~O~RT~"B~'_' ______ ~ I

- - --- - - ----+-------'

CASE DRAI N PWB

1-110H PRESSURE CHECK PORT

V

WEIGHTS - CAPACITIES - DIMENSIONS

Unit - Gas with Boom, less bucket ............. 6680 Ibs. Unit - Diesel with Boom, less bucket ........... 6700 Ibs. Unit complete (Ga.) 14 ft. mast ............... 8832 Ibs.

specifications Unit complete (Gas) 21 ft. mast ............... 8982 Ibs. Unit complete (Diesel) 14 ft. mast .........•... 8747Ibs. Unit complete (Diesel) 21 ft. mast ............. 8897 Ibs. Dirt bucket· 65" wide - 5/S yard ............... 375 Ibs. Utility bucket· 65" wide - 3/4 yard ............. 440 Ibs.

/

-- - ...... '-

, ,

, , Light Material bucket - 89" wide - 1 yard .....•... 540 Ibs. Overall height Ito top of muffler) ..........•....... 7'6" Height to top of cab or roll bar ...........•....... S'6" Height with mast .......................•..... 9'10"

L __ ------~·~r~----------.

Overall width _ •..•..• '.' ..............••....... 5'5" Overall length (bucket level, no teeth) ............. 14'S" Length (with 48" forks) ......................• 15'10" Ground Clearance ............................... 9" Wheelbase ...•.•.............................• 62" Rear Axle oscillation ...•..............•.•.. up to 2~ Maximum bucket dump angle (full height) ........... 400

Dumping reach (full height, bucket at 4QO) •••••••••• 3'4" Dumping clearanca (full height. bucket at 400 ) ••••••••• 8' Maximum lift (bucket at full height at pivot pin) .•..... 10'

r---- __ ""'=-" ________ _ ) I I , ,

Digging depth below ground (bucket level ............ 1" Bucket roll-back (ground level) .. . .........•...... 400

Bucket reach (bucket on ground) ..........•....... 5'6" Break-out force (Fulcrum at bucket pivot pin) .... 6500 Ibs. Tipping load Straight .......•..........•..... 3900 Ibs. Tipping load fully articulated ••............••. 3200 Ibs. Lift capacity to full height (Capacity at relief) ...• 3400 Ibs. Raising time ................•........... 5.5 seconds Lowering time (power) ....•.•.......•..•.. 3.5 seconds Dumping time •••••.....•........•...•.•• 1.5 seconds

H~~~ t= 5' 6" ____ .i._ 2' 7"4-2' 7"-1

Fuel tank ••..•••...•.....•...•...•.....•. 19 gallons Engine oil •........•...........•..•......•. 6 quarts Hydraulic oil (13 gallon reservoir) •........ 19 gallons total Standard tires •...•.................. 12 x 16.5 S ply Optional tires

(Standard with Vertical Mastl ...... 14 x 17.510 ply

HORSEPOWER (at 2450 rpm) (jntermittent rating) Ford gas, 172 cubic inch ...................... 52 h.p. Ford diesel, 172 cubic inch ..•............•.... 50 h.p.

HYDRAULIC SYSTEMS Loader functions - 23 GPM at 2450 rpm. Constant volume system, 1500 psi. Steering functions - 8 GPM at 2450 rpm. Constant volume system, 1400 psi, air oil cooler (640 BTUI Min.).

ELECTRIC SYSTEM 12 volt with key ignition and start. 55 amp alternator. Trans­sistor voltage regulator. 61 amp hour battery - gas. 95 amp hour battery· diesel.

STEERING Char-Lyn power steering. Frame steered by two hydraulic cylinders. 360 articulation, left and right. 11 foot turning radius. Curb clearance circle .......... 25 ft.

'l'"RAVEL SPEEDS Low 0 - 4.5 mph .....•.............. High 0 - 13 mph

STANDARD EQUIPMENT Transmission oil temperature gauge; fuel gauge; electric hour meter; tachometer; ammeter; engine coolant temp. gauge; engine oil pressure gauge; instrument panel light; vendal proof instrument panel cover; fuel filter; dry type air cleaner with re­strictor indicator; engine side shields; front and rear fenders; anti-freeze; horn; turn Signal lights; flasher werning lights; front and rear work lights; glow plug starting aid for diesel. Brakes - Hydrostatic braking while machine is in operation. Adjust­able hand operated parking brake (drum brake on axle pinion). Tires - 12 x 16.5 sure grip tread, S ply.

SPECIAL EQUIPMENT Cab; roll guard; 700 lb ... 'OUnter weights; 1 spool auxiliary valve with hydraulic lines to front of boom, 14 x 17.5 10 ply tires

14' 8"----------------01

72°

o o

I I iot-r --- 5' 5" ------I~

MAST INFORMATION _____________ ~ _____ ..,

Tilt back •.••.•.•..•••....•........................ 1 ~ Tilt forward •.......•••.••......•.•................. 200

-Lift height and rating 14 ft. mast full height ...• 5000 Ibs. at 14 ft. -Lift height end rating 21 ft. mast full height .... 2500 Ibs. at 21 ft. -!.ift height and rating 21 ft. mast 14 ft. high •... 4000 Ills. at 14 ft.

Forks ....... _ ............................... 2 x 4 x 48" Lift speed ...... _ ..••.•.................. 60 ft. per minute Hydraulic lift cylinder •....•..............•............ 4' Hydraulic tilt cylinder .•............................... 3'

-Ratings based on U.S.A. Standerd B56.1 - 1969 safety standard for powered industrial trucks at 24 inch load center.

VI

CONTROLS and INSTRUMENTS

For safe and efficient operation, familiarize yourself with the controls and instruments before operating. Read this manual carefully for complete instructions.

1. Steering 2. Lights 3. Key switch 4. Tachometer 5. Turn signal 6. Choke 7. Boom Lever 8. Bucket lever 9. Engine oil pressure

10. Ammeter 11. Engine Temp. 12. Horn 13. Foot throttle 14. Hand throttle 15. Parking brake 16. Fuel gauge 17. Hydraulic oil filter vacuum 18. Hydraulic oil temperature. 19. Clutch pedal 20. Variable speed lever 21. Brake Light

CAUTION: Do not run t~e engine in an enclosed shed or garage. Make sure there is plenty of ventilation.

1

OPERATION

ENGINE OPERATION Complete instructions for safe and efficient operation are given on the following pages. Follow these instructions carefully.

WARM-UP PERIOD

Warm up engine before operating under full load. Oil will then circulate freely, preventing excessive wear on piston rings, cylinders, and bearings. Do not race the engine ,or idle it during warm-up period.

It is good practice to operate the loader under a lighter load than normal,for the first 30 minutes.

ENGINE IDLING Avoid unnecessary engine idling. Prolonged idling may cause the engine coolant temperature to fall below its normal range. This causes crankcase oil dilution,due to incomplete fuel combustion, per­mitting formation of lacquer or gummy deposits on valves, pistons, and piston rings. It also pro-motes rapid accumulation of engine sludge.

ENGINE SPEEDS The loader is equipped with a variable speed engine ,controlled by a hand throttle. For maxi­mum efficiency from the loader engine and hydrostatic transmission combination, operate the engine between 2000 and 2400 rpm. Maxi­mum continuous power at full load is obtained at 2400 rpm.

PRE-STARTING INSPECTION

Perform the following checks before starting the engine,for the first time each day:

2

(a) Check the engine crankcase oil level. (b) Check hydraulic reservoir oil level. (c) Check the radiator coolant level. (d) Inspect the air cleaner; service if necessary.

STARTING THE ENGINE

CAUTION: Never start the engine unless you are in the operator's seat.

IMPORTANT .. Do not attempt to start the loader by towing. To do so will damage trans­mission parts.

1. Make sure forward and reverse foot pedal is in neutral position. 2. Push throttle lever ahead approximately half way. 3. On gasoline engines, use choke control as needed to start engine and for proper engine operation. In cold w.eather, depress the clutch pedal. This disconnects all the hydraulic pumps for easier starting. 4. Use cold weather starting aids on all engines as necessary.

OPERATION

5. Turn the key switch "on" and turn to "start" position. To avoid overheating the starter do not crank the engine for more than 20 seconds at a time. Wait two minutes between attempts. If engine will not start, see page 36. 6. After engine starts, adjust speed to half throttle. Observe all gauges. If they indicate abnormal operation, stop the engine and deter­mine the cause. It may be necessary to increase engine speed momentarily to reach alternator "kick-in" speed. 7. In cold weather, warm the engine for five minutes at half throttle before applying a load. Do not operate engine at slow idle speed during warmup.

STARTING THE DIESEL ENGINE

o Degrees F. - 32 Degrees F. A. Engage heater button 1 Yz minutes. B. Start engine within Yz minute of cranking. C. If required, engage button % minute. D. Start engine.

CAUTION: Do not use ether: with heater plugs.

COLD WEATHER STARTING AIDS

To assist in cold weather starting, several aids are available. These aids are effective at low tempera­tures only when the engine is otherwise operating satisfactorily. They will not correct such deficien­cies as low battery charge, crankcase oil of too high viscosity, and high electrical resistance.

BOOSTER BATTERIES

Connect the positive (+) terminal of the booster battery to the positive terminal of the loader battery and the negative (-) terminal to the nega­tive ground. Make positive terminal connection at battery and use insulated jumper cable con­nectors.

IMPORTANT: Batteries are NEGATIVE grounded. Reversing the polarity in battery connections will result in damage to the elec­trical system.

ENGINE COOLANT HEATER

A 1000 watt, 115 volt electrical coolant heater can be installed on the engine. The heater cir­culates heated coolant for fast starts in extremely cold weather.

CAUTION: To prevent accidental electrical shocks, always use a grounded cord to connect coolant heater to power source.

STOPPING THE ENGINE

I. Stop the unit and lower bucket to the ground. Apply the parking brake. 2. Cool the engine gradually by running it at half throttle. Sudden cooling of a hot engine causes extreme contraction of parts and may cause damage to the engine.

3. Turn the key switch to vertical (OFF) posi­tion. (On diesels, first stop engine by pushing throttle lever all the way back; then turn off key switch.)

LOADER BREAK-IN PERIOD

The first 100 hours is the loader "break-in" period. During break-in, observe these rules:

(a) Operate at normal load. Cb) Avoid light loads. C c ) Avoid prolo·nged engine idling. Cd) Check crankcase oil level periodially. If

oil is needed, use the type recommendep. Drain crankcase and replace engine oil filter after the 100 hour break-in. Fill crankcase with recom­mended oil.

3

DRIVING

4

SELECTING TRAVEL SPEEDS

Forward and reverse)and speeds are accomplished by movement ofthe forward-reverse control foot pedal. Pushing on the top of the pedal causes the machine to move forward; pushing on the bottom of the pedal causes the machine to move back­ward. The farther the pedal is depressed either way, the faster will be the travel of the loader. To get maximum push power, depress the pedal only part way. If the pedal is depressed too far when loading the bucket, the engine will stall. If this happens, wait ten seconds before restarting the engine to allow pressures in the hydrostatic system to equalize to prevent excessive load on the starter, or depress dutch pedal before restart.

Forward and reverse movement of the pedal can be made at any engine speed, or any travel speed in forward or reverse.

The high low range lever provides a higher road speed for the machine. This can be shifted from low to high or high to low, while the machine is in motion at any speed. The foot control pedal still controls the forward or reverse motion of the machine whether in low or high range. High range should not be used for reverse, however, for safety.

LOADER TRAVEL SPEEDS

Travel speeds shown below are with 12 x 16.5 tires:

Low Range High Range

0- 4Y2 mph 0-13 mph

POWER STEERING

The loader is equipped with hydraulic power steering.

CHECKING OIL TEMP GAUGE

The oil temperature gauge indicator should not go beyond 2500 . Overly severe operating condi­tions may cause overheating. Run the engine at 1000 to 1500 rpm (half throttle) in neutral until normal temperature (1800 to 2000 F) is restored. If the temperature rises to 2500 under normal operating conditions, stop the engine and locate the trouble.

LIMITED SLIP DIFFERENTIAL

Your loader is equipped with limited slip axle assemblies. With this the drive wheels provide power to each wheel under varying tractive conditions.

A gear set is also available as a kit which can be installed in either the front or rear differential that provides for full lockup of the differential at all times for maximum traction.

OPERATION

PARKING BRAKE

Use the parking brake whenever the loader is not in operation. Pull brake lever back to vertical position. To disengage brake, push lever fully forward. A parking brake light warns the operator whenever the brake is engaged.

CLUTCH CUTOFF CONTROL

At any time, the clutch pedal may be depressed to immediately stop all hydraulic functions, including forward or reverse travel of the machine.

CAUTION: Be sure the forward-reverse foot pedal is in neutral before letting clutch pedal back out) to prevent unexpected movement of the machina.

TOWING THE LOADER

IMPORTANT: Do not tow the loader to start the engine under any circumstances.

Towing the loader is not recommended. However, if it is necessary to tow it, disconnect drop box from main drive shaft. If possible, run the engine while towing to activate steering.

NOTE: If loader is transported on a flatbed carrier, be sure frames locking bar is secured.

TOWING WITH ALL FOUR WHEELS ON THE GROUND

Do not tow in excess of lO mph with all four wheels on the ground.

An operator should be on the loader to control brakes,whether or not the engine is running.

A tow chain can be used only,if the loader brakes and steering are still operative. Do not use a tow chain if brakes have failed - use only a solid bar.

TOWING WITH REAR WHEELS RAISED OFF THE GROUND

Remove center drive line and U joints.

It is safer to tow the loader with rear wheels raised. Do not tow in excess of 20 mph.

It is not necessary to have an operator on the machine when towing under this condition.

Block loader boom in the raised position so that it cannot strike the ground. Use the locking bar to prevent the loader from pivoting at the hinge area.

When towing the loader, use the drawbar as the hitch point.

5

OPERATON

FRAMES LOCKING BAR

The frames locking bar is used to prevent the frames from accidentally pivoting.

CAUTION: Do not work around frames hinge area without first securing frames with locking bar.

6

TIRE INFLATION PRESSURES

When working with loose material, inflate tires to normal air pressure. When hard digging is necessary, inflate tires to maximum pressure to prevent front tires from buckling.

Normal - 50 lbs. Maximum - 551bs.

SEAT

To move the seat forward or backward, disengage the seat latch. Slide the seat to the desired posi­tion and release the seat latch lever.

CAB, ROLL GUARD

A protective roll guard/or cab may be ordered as special equipment for your loader.

CAUTION: Under almost all operating condi­tions:

1. The use of a seat belt with the optional pro-tective roll guard or cab is recommended. 2. Use of a seat belt without roll-over protec-tive equipment is not recommended.

CARRY LOADED BUCKET LOW FOR STABILITY

OPERATION

LIGHTS

Your loader is equipped with headlights, tail­lights, and dash lamps as standard equipment.

One light switch on the right dash panel and a turn signal switch on the left side of the steering column control the lights.

The first position gives red lights in the rear; the second position gives white work lights in the rear. Use push-pull switch at the right to control the front and rear lights.

The turn signal switch operates the flashing warn­ing lights. It is used to indicate a left or right turn,as well as to operate all four warning lights.

HORN

The electric horn is controlled by a button on the steering column.

DON'T TRAVEL AFTER DARK WITHOUT PROPER LIGHTS OR REFLECTORS

7

BOOM , BUCKETS and ACCESSORIES Two control levers operate the boom and the bucket. When the cylinders have been fully extended or retracted, the valve control lever should be immediately returned to the neutral position to prevent oil from bypassing through the relief valve and becoming overheated.

RAISING OR LOWERING THE BOOM

Move the control lever forward to lower the boom, and backward to raise the boom.

Releasing the control lever at any time during normal loader operation will automatically return lever to neutral, holding the boom in the position reached at that time.

DUMPING OR RETRACTING THE BUCKET

The bucket retracts when the control lever is moved backward and dumps when the control lever is moved forward.

Dumping and retracting speed is controlled by! the distance the control lever is moved.

8

FLOAT POSITION

When the boom control lever is pushed all the way forward to the float position, it will stay there until it is manually released. This allows the boom to move up or down as the bucket follows the contour of the ground.

IMPORTANT: Never lower a loaded bucket with the control lever in the float position.

OBTAINING THE FASTEST CYCLE TIME

Reduce cycle time by controlling the boom and bucket simultaneously. Move both levers at once.

AUXILIARY CONTROL LEVER

The auxiliary control lever operates a two-posi­tion valve for use with optional attachments This lever is installed in the opening next to the outside control lever.

MATERIALS BUCKETS

The 5/8 cubic-yard bucket (3300 pounds per cubic yard) and the 3/4 cubic-yard bucketJ2800 pounds per cubic yard) are designed for loading loose materials. Bucket teeth are available to assist in digging. Install bucket teeth tightly against bucket cutting edge, and weld on.

LIGHT MATERIALS BUCKET

A I cubic-yard capacity bucket is available for loading light materials such as furnace slag, snow, and many other light materials,which weigh less than 1500 pounds per cubic yard.

WEIGHTS

A 700 lb. weight is available for added stability of the loader. It bolts on to the rear bumper.