SHOP MANUAL
HYDRAULIC
Ch 5 page 24 Ch 5 page 25
HYDRAULIC
• Variable axial piston pump
• LS – operated
• Mounted at rear of transmission
• Driven by the engine
• Ratio 1:1
• Maximum volume 145 ccm
• Stand – by pressure 25 ±2.0bar (idle)
• Maximum (tilt) pressure 280 ±5.0bar
(1000 rpm)
The Main Hydraulic Pump is located at the rear end of the transmission. Pump is accessed from rear, under
the cab.
Removal
Thoroughly clean the main 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.
To ease removal of pump, also disconnect the hoses connected to the top of the return line manifold. Also dis-
connect the flange coupling at the right side of the fan drive pump.
Unscrew the bolt securing the pump to the transmission.
Lift the pump out from the truck for exchange or overhaul.
Installation
Apply a light coat of lubrication on the axle splines. Check that the o-ring is installed to seal the mating flange,
and position the pump onto the transmission.
Check that the pump is properly seated, and tighten bolt.
Clean the flange couplings, and install new o-rings.
Connect the flange couplings, ensure that the hoses are positioned in correct angle, and tighten the bolts.
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.
Pump description
Main Pump
Figure 8
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