SHOP MANUAL
HYDRAULIC
Ch 5 page 46 Ch 5 page 47
HYDRAULIC
• Variable radial piston pump
• Mounted on rear of transmission
• Driven by output shaft (Ground driven)
• Maximum volume: 32 ccm
• Maximum delivery: 50 l/min
The dump truck is equipped with a ground driven radial piston pump fitted
at the transmission.
This pump makes the truck steerable if the engine stops or main pump
drive fall out.
The radial piston pump is very convenience due to the same flow direction
either rotation of the pump. This ensures emergency steering function
when driving either forwards or backwards.
The pump displacement is 32 cm3/rev, and the oil flow is maximum 50 l/min.
If the main hydraulic pump should fail during driving (or engine stops), the connecting valve in steering valve will
direct the oil flow from the emergency steering pump to the steering circuit.
At the same time the flow indicator valve will meter low or no oil flow and thereby connect the warning light
at the instrument panel.
The Emergency Steering Pump is located at the rear end
of the transmission, just above the rear output shaft.
Access is from rear of front wagon, through the drive shaft tunnel.
Removal
Thoroughly clean the emergency pump and the area around for any accumulated dirt.
Place a container below the pump to catch any hydraulic fluid spilt during removal.
Mark both hydraulic lines for proper location and plug lines as they are removed from pump.
Unscrew the 4 Allen screws securing the pump to the transmission.
Lift the pump out from the truck for exchange or overhaul. If the pump is exchanged,
save the hose fittings attached to the valve body.
Installation
Check the condition of the connector seals, replace if necessary. Install the connectors in the valve body, using
a light coat of oil on the seals, and tighten.
Check that the o-ring is installed in groove in pump mating flange.
Apply a light coat of oil on the axle splines, and position the pump onto the transmission.
Check that the pump is properly seated, and thighten the 4 Allen screws.
Install the hydraulic line hoses.
Control
Before startup - Check that all connections are located in the same positions as before removal, and that all
hoses are correctly routed.
Perform startup test procedure. Ref. section: Startup test procedure.
Emergency steering pump
Figure 31
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