(1)Disconnect battery. Remove bolts to loosen hydraulic fluid cooler/radiator and leave in place without disconnecting hoses. Drain engine coolant radiator. Remove fan guard and coolant radiator. Remove fan and belt pulley. (2)Remove two bolts(12 sided socket) holding gear hydraulic pump to rear engine motor mount. Spray pump mount, spline shaft, and pump coupling to crank shaft with penetrating oil. Use small chisel and hammer to gently separate the pump from the motor mount. The pump spline shaft will be drawn out of the coupling spline as the pump is worked away from the motor mount. Process may be slow and tedious due to the pump spline being fused to the coupling spline by dirt and corrosion. (3)Once the pump begins to move out, two larger chisels on either side of the pump flange can be driven in gently to work/pull the spline/pump out with added penetrating oil. The hydraulic fluid lines connected to the pump, though looking short, did have enough slack to allow complete removal of the pump and spline to clear the motor mount without removal or draining hydraulic fluid. (4)With the pump shaft now out of the way, the fan belt can be carefully slid between the motor mount and coupler. Note that the hole in the steel motor mount that the pump shaft goes through, which is about 3” diameter, has a slot/notch cut out at the bottom(6 oclock-which cannot be seen or accessed with the pump in place). This slot is necessary for removal of the four bolts that hold the pump coupler to the crank shaft (with engine rotation) if coupler replacement is necessary. (5)Now is a good time to inspect/replace all rear engine components, fan belt, water pump, idler/tension pulleys, alternator, hydraulic pump/coupler, radiator hoses etc. (6)Clean and grease the pump and splines and reinstall all components and bolts using appropriate "loctite" and torque. Remember to put fan guard in place with the radiator. Fill all fluids.
No replies yet.