HYDRAULIC SYSTEM Ch 5 page 24 Main Pump Pump description Variable axial piston pump LS – operated Mounted at rear of transmission Driven by the engine Ratio 1:1 Maximum volume 140 ccm Delta pressure 20 ±2.0bar (idle) Maximum (tilt) pressure 280 - 286 bar (1000 rpm) Figure 17 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. Drain tank and suction hose. 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 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. Fill oil on hydraulic tank. 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. SHOP MANUAL