GM 22071780 Pump Assembly, Windshield Washer

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For the rectangular motor type, the washer pump can be removed in the absence of the washer or separately by disconnecting the hoses and wiring and by removing the screws and lifting off the pump. The four lobe washer pump drive cam should be pulled off, most probably, with a help of a flathead screwdriver, as it is press-fitted. Subsequently, the washer at the wiper shaft is unscrewed; the screw of the ratchet dog is removed to lift the solenoid and the dog from the frame of the pump and, if necessary, to detach the dog from the mounting plate. The ratchet wheel is removed by pulling out the spring from the groove of the shaft to enable the wheel to slide on. The pump and pump actuator plate are released by pulling the pump housing to the valve end until the grooves are out of the frame and reassembly is done in the reverse manner, and installation as well is done in reverse order. In the round motor type, the hoses of washers and wires from the pump relay are disconnected, and the cover made of plastic of the pump is unbolted. The frame screws are removed and this pulls out the pump and frame; the screw is then removed to shift the ratchet dog off the mounting plate. The pawl spring is released from the pawl, thus enabling the pawl to get off the cam follower pin. To do this the ratchet spring is lifted out of the shaft slot, while pressing down the relay armature against the relay coil the ratchet wheel is slid off the shaft. The retainer is unscrewed and the cam is thus pulled off the shaft and the relay armature and spring is also taken out. Just like the number 10 C-Clip, the four tabs fitting the coil mounting bracket are engraved to clear the relay coil and terminal board. The pump head and the holder is separated by pulling this towards the valve end until the grooves disengage the base and the cam follower pin thereby enabling the service of the piston and the plastic housing in one piece. The valve can be separated from the pump housing and the screws, numbered from 1 to 4 in order to demount it but before that the position of the valve relative to the housing must be noted down. Disassembly on the other hand is done in the opposite order so as to guarantee that the wiper motor is in the 'Park' position after the assembling process of the pump and the wiper motor.

Thus for the 1969 to 1974 rectangular motor sort the washer can be disconnected with the help of washer hoses and electrical wiring and the washer pump can be replaced because it is bought off of the wiper motor by the removal of the latter's screws. The, four lobe washer pump drive cam which is a press fit has to be pulled off and the felt washer on the wiper shaft. Following that, the ratchet dog retaining screw can be removed and therefore the solenoid assembly and ratchet dog can be lifted off the pump frame with, in the case of the type of arrangement described in this paper, the separation from the mounting plate if needed. For the removal of the ratchet wheel, the spring has to be out of the shaft groove and the wheel can then be slipped off. The pump and pump actuator plate can be released from the frame by pulling the pump housing forward to the valve end in order for the grooves to clear the frame. Resuction is the exact opposite of sution, and reassembly is the process in the reverse of that which was carried out during the dismantling process. Start with the 1969 round motor type by disconnecting the washer hoses and wires from the pump relay After that you have to eliminate the plastic pump cover and the frame screws before you can pull out the pump and frame. The ratchet dog is easily separated from the mounting plate by pulling out the screw and the pawl spring must be released from the pawl before the pawl is slid off the cam follower pin. The ratchet spring can be lifted out from the shaft slot and the ratchet wheel can be slid of while keeping the relay armature against the relay coil. The retainer can be bent open so that the cam can be pulled off the shaft; the relay armature and spring can also be removed now. The four tabs for the coil mounting bracket have to be chiseled in order to remove the relay coil as well as terminal board. To remove the plastic pump housing, pull it towards the valve end until the grooves are out of the base and released from the cam follower pin and the piston and the plastic housing are serviced jointly. The valve can be removed from the pump housing after pulling out four screws and thus the orientation of the valve to the housing was indicated before disassembly. The reverse of dismantling is assembly, and when assembling, the wiper motor should be in the 'Park' position before joining the pump and the wiper motor.

Installation is the reverse of removal.

Raising the hood on most later models will facilitate easier wiper arm removal.

Position the arm over the shaft and press down, making sure to install the arms in the same position on the windshield as they were when they were removed.

Remove the screws mounting the reservoir, disconnect the fluid hoses, and pull the reservoir from the engine compartment.

Remove the ratchet dog, pawl, ratchet spring, and other components.