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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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Presentation Transcript
pump services

Pump Services

Tom Birch, 6/07

remove pump
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

slide3
RP 2

This puller attaches to the stator support and pushes against the turbine shaft.

Stator Support

Turbine Shaft

Puller

Tom Birch, 6/07

valve body mounted
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

offset mounting
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

pump assembly
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

front view
Front view

Pump Body

Front Seal

Stator Support

Turbine Shaft (entering transmission)

Tom Birch, 6/07

pump types
Pump Types

Internal—External Gerotor Vane Gear with Crescent

External Gear

Tom Birch, 6/07

remove cover
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

wear check
Wear Check

The cover has been removed, and the gears and fluid passages are exposed.

Tom Birch, 6/07

slide11
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

replace pump
Replace Pump

A pump with obvious damage or excessive clearance should be replaced.

Tom Birch, 6/07

remove front seal
Remove Front Seal

The front seal can often be pried out of it’s cavity.

Tom Birch, 6/07

seal replacement
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

seal replacement drain back
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

gear alignment marks
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

install gears
Install Gears

Recess

The recess on the inner pump rotor must face the pump body.

Tom Birch, 6/07

align pump
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

tighten cover bolts
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

test rotation
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

r r pump seal
R&R Pump Seal

The pump seal should be removed and replaced with a new one.

Tom Birch, 6/07

align gasket
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