Digger Derricks

The all new pilot control system

“Raising Values to New Heights”

Traditional “T” handle Command Post Controls

Hydraulic Foot Throttle to

Control Chassis Engine RPM

Cushioned Operator Seat with

Fore and Aft Adjustment for

Optimal Operator Comfort

Digger and WinchControls in Easy

Reach

System Pressure Gauge

Auger Stowage Release

Digger Shift Control for

2-Speed Digger

Large Control Console

Allows Customization of a Variety of

Optional Features (example Start / Stop)

Hinged ConsoleSwings Away for

Maintenance Access

Control Station Rotates With

the Boom Maintaining Visibility

Boom Controls Located Within

Operator Comfort Zone

“Raising Values to New Heights”

Dual Joystick Pilot Operated Control Station

*Dig/Win & 2ND/3RD select do not have to beheld for continuous operation

One emergency stop button for total system shutdown.

Long lasting LED indicator lights inform operator of

• system enable

•digger shifted to high•digger select•radio/top controls on• auger release activated• 3rd section select.

Radio/top controls on/off switch

System pressure gauge

Left Hand Right Hand

“Raising Values to New Heights”

Hydraulic system “T” handle style controls

HP(Torque)

Engine (Power source)

Hydraulic pump (Power source)

HP(Fluid power)

Low side flow 18 gallons per minute

HP(Fluid power)

High side flow 22 gallons per minute

HP(Fluid power)

Low side travels to “mix” with high side flow to achieve a total of 40 gallons per minute

Unused flow or return flow from a working function is routed back to the reservoir

Sectional control valve for boom functions Sectional control valve for Digger & Winch

Return flow from boom functions

“Raising Values to New Heights”

Cast section valves explained

Sectional valves used in “T” handle command post

Sectional valves use up to four o-rings in between each function and on each end, which are all areas for potential leaks.

Tie rods hold the entire valve stack together compressing o-rings and applying a “preload” to the section spools. This torque is extremely important for free spool travel and o-rings life. This can be a difficult variable to control.

“Raising Values to New Heights”

Transition from cast sectional valves to manifold/cartridge technology

From this…..

To this

Why is this

better?

“Raising Values to New Heights”

Transition from cast sectional valves to manifold/cartridge technology

HP(Torque)

Engine (Power source)

Hydraulic pump (Power source)

HP(Fluid power)

Low side flow 18 gallons per minute HP

(Fluid power)

High side flow 22 gallons

per minute

Unused flow or return flow from a working function is routed back to the reservoir

Hydraulic pilot

controllerOperates on 300psi

Advantages:•Low (18gpm) and high (28gpm) pump sides combine within manifold. No section seals and no tie rods.

•Cartridge valves have a spool that is self contained in their own individual housings. They are not affected by outside forces after factory setting and testing.

•Resistance to oil flow when you are not running a function (i.e. idling with the PTO engaged) wastes energy. Anytime a hydraulic system can be designed to reduce resistance to flow you save heat and horsepower which equals a fuel savings. The new pilot control system reduces flow resistance by 300psi.

“Raising Values to New Heights”

H.O.P. System Protects Digger Derricks by Monitoring Hydraulic Pressures

Overloading conditions cause pressure in the base of the lift cylinders beyond normal system pressure.

The overloading conditions can be caused by the following:

• Lifting With The Winch

• In excess of the digger derrick’s hydraulic capacity

• Extending the Second or Third Boom Section

• With an excessive load

• While trying to “push / pull” a pole that won’t move

• Corkscrewing The Auger

• Without lowering the boom

Boom Hydraulic Overload Protection ( H.O.P. ) System

“Raising Values to New Heights”

What Happens During an Overload Situation?

• Excessive load on the boom creates excessive pressures in the base of the lift cylinders.

• A sensing valve recognizes excess pressure and opens the H.O.P valve.

• The function causing the overload is halted, as the oil is diverted back to tank.

If... Then...

digger caused the overload reverse the digger

winch caused the overload lower the load with winch line

boom extension caused the overload retract the boom

Boom Hydraulic Overload Protection ( H.O.P. ) System

“Raising Values to New Heights”

Protects system from overloading by monitoring hydraulic pressures.

Rotation Hydraulic Overload Protection ( H.O.P. )

What Happens During an Overload Situation?

• Excessive load on the rotation system compresses oil contained within the worm gear box.

• Sensing valve recognizes excess pressure and opened H.O.P. valve.

• Overloaded function is halted while oil is diverted back to tank.

• When overload condition is eliminated, all functions become operational.

If... Then...

digger caused the overload reverse the digger

winch caused the overload lower the load with winch line

Advantages

• Protects rotation system from damage due to side load

• Rotation system will continue to hold the load while condition is eliminated

• Does not allow the rotation system to slip through rotation on aside hill

• Allows work to resume immediately after overload condition is eliminated.

View of boom rotation worm gear

with HOP installed

“Raising Values to New Heights”

Boom Hydraulic Overload Protection ( H.O.P. ) System

“T” handle style HOP system

explained

Overload sensing valve

“Dump cartridge” is installed in each function that is protected by HOP. This valve as you see is fairly complex and sensitive to contamination. When activated it dumps full function flow (up to 18gpm) to the tank port in the valve.

Hose from base end of lift cylinder carries pressure readings to overload sensing valve

“Raising Values to New Heights”

Boom Hydraulic Overload Protection ( H.O.P. ) System

To control function

Overload sensing valve

Hose from base end of lift cylinder carries pressure readings to overload sensing valve

Notice significant reduction in the HOP system components and complication. All results in more reliable system.

Pilot oil from joystick is redirected to tank when a function is to be disabled by HOP. This is really a minute amount of flow, mostly a pressure release. No “dump” cartridges or complicated valves.

Pilot control system style HOP

system explained

“Raising Values to New Heights”

Tilt Pole Plummer Holding Valve Simplification

Tilt and Claw holding valves located in main manifold in turret.

These external holding valves are removed to eliminate the potential damage to them while working a pole.

“Raising Values to New Heights”

Tilt Pole Plummer Holding Valve Simplification

Relief/Junction manifold located in tower. This is eliminated in the Dual pilot system and the Installer simply runs the pressure, return, and drain hoses directly to the hydraulic swivel. This means less congestion in the tower for maintenance and less potential leak points!

“Raising Values to New Heights”

Competition Dual Joystick Controls

Left Hand Right Hand

Claw open/close

Tilt up/downStart/Stop

Radio on/off

Digger shift

No front protection

“Raising Values to New Heights”

Competitive Comparison

Terex Competition

• Hydraulic pilot (300psi) control system for all boom functions. Enable, Claw tilt up/down, and Claw open/close are the only electric controlled functions. They are simple 12V on/off circuits, NO CPU.

• Electronic control system for all unit functions. Utilizes a CPU to be the "brains" of the unit increasing the potential for complicated troubleshooting.

• HOP system operates on full hydraulic sensing and dumping.

• HOP system relies on hydraulics sensing but electronic function cut-out.

• No sectional valves, all manifold and cartridge control valves.

• All boom functions operate from cast sectional valves.

• Claw tilt up/down, Claw open/close, Digger shift, and Auger release all controlled from joystick handles.

• Claw tilt up/down, Claw open/close, Digger shift, and Auger release all controlled from console, you must remove your hands from the control joysticks to operate.

• Fully reinforced front gate and side rails to protect operator without impeding working views.

• No front gate for operator protection.

• All joystick controls operate with front/back and side/side motions.

• Boom rotation requires a "twisting" of the right joystick which is not an ergonomic motion