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Pump Services

Pump Services. Remove Pump. The pump is the front cover for many transmissions. It is removed to gain access to the internal components. A pair of slide hammers have been threaded into the pump body in order to break the pump loose from the transmission case. Pump Assembly

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Pump Services

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  1. Pump Services Tom Birch, 6/07

  2. Remove Pump The pump is the front cover for many transmissions. It is removed to gain access to the internal components. A pair of slide hammers have been threaded into the pump body in order to break the pump loose from the transmission case. Pump Assembly Slide Hammers Tom Birch, 6/07

  3. RP 2 This puller attaches to the stator support and pushes against the turbine shaft. Stator Support Turbine Shaft Puller Tom Birch, 6/07

  4. Valve Body Mounted Some transaxles, like the 4T60, mount the pump on the valve body and drive it using a small drive shaft. Pump Tom Birch, 6/07

  5. Offset Mounting Pump Some, very short, transaxles mount the pump to the side and drive it using a roller chain. Drive Chain Tom Birch, 6/07

  6. Pump Assembly Body Thrust Washer Seal Rings Cover Pump Gears Valve Assembly (in some pumps) This exploded view shows the major components. Tom Birch, 6/07

  7. Front view Pump Body Front Seal Stator Support Turbine Shaft (entering transmission) Tom Birch, 6/07

  8. Pump Types Internal—External Gerotor Vane Gear with Crescent External Gear Tom Birch, 6/07

  9. Remove Cover A group of bolts secures the cover to the pump body. Removing these bolts and the cover allows inspection of the pump gears. Tom Birch, 6/07

  10. Wear Check The cover has been removed, and the gears and fluid passages are exposed. Tom Birch, 6/07

  11. WC 2 The clearance between the outer gear and the housing is being measured with the feeler gauge. Specifications are often available for the clearance for the crescent to outer gear and the crescent to inner gear (red arrows). Tom Birch, 6/07

  12. Replace Pump A pump with obvious damage or excessive clearance should be replaced. Tom Birch, 6/07

  13. Remove Front Seal The front seal can often be pried out of it’s cavity. Tom Birch, 6/07

  14. Seal Replacement Seals are often driven in place using a seal driver to prevent damage to the new seal. Make sure that the seal enters straight into the cavity. Seal Driver Seal Tom Birch, 6/07

  15. Seal Replacement, Drain Back Seal Cavity The drain back passage returns fluid from the seal cavity to the sump. It must be clean and open for fluid flow. Drain Back Passage Tom Birch, 6/07

  16. Gear Alignment Marks These marks show the front or back of the gear. Both gears are normally installed in the same position as they were originally. Tom Birch, 6/07

  17. Install Gears Recess The recess on the inner pump rotor must face the pump body. Tom Birch, 6/07

  18. Align Pump The alignment tool positions the pump gears to center them to the torque converter. The pump cover bolts can now be tightened to the proper torque. Note that the pump body is part of the transmission torque converter housing. Alignment Tool Tom Birch, 6/07

  19. Tighten Cover Bolts 1 4 2 6 The pump cover bolts should be tightened to the specified torque using a pattern the moves across the cover. 3 5 Tom Birch, 6/07

  20. Test Rotation The two screwdrivers engage the pump drive flats to make sure that the pump gears can be rotated. The pump gears should rotate smoothly. Tom Birch, 6/07

  21. R&R Pump Seal The pump seal should be removed and replaced with a new one. Tom Birch, 6/07

  22. Align Gasket The pump gasket was placed on the transmission case, properly aligned, and held in position by the studs while the pump was placed in position and the bolts installed. The bolts should be tightened to the specified torque Studs Socket Wrench Tom Birch, 6/07

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