Adjust End Play

1
Adjust End Play Preload
2
End Play
This gear set floats between thrust washers 1 and
10 there must be enough clearance so the thrust
washers have a good layer of fluid for
lubrication.
3
Preload
Tapered Roller Bearings
This transaxle differential rotates on a pair of
tapered roller bearings. There must be a slight
load on the bearings to prevent free movement. A
shim is used to adjust the preload.
Adjusting Shim
4
Measuring End Play
Dial Indicator
A dial indicator is used to measure end play as
you lift and drop the input shaft. Positioning
the transmission shaft with the shaft vertical
lets gravity move the shaft and gears toward the
rear of the transmission.
5
MEP 2
After setting up the dial indicator, most
technicians will take 3 measurements. Lets say
they are 0.027, 0.033, and 0.030. Next, add
these together (0.090), and divide by 3 to get
the average which is 0.030.
6
Adjust End Play
Look up the end play specification for your
transmission. Lets say it is 0.0040.022, and
you just measured an end play of 0.030, too
much. Subtract the specs. from your reading
0.030 0.022 0.008, 0.030 0.004
0.026 You have between 0.008 and 0.026
too much end play.
7
AEP 2
The selective thrust washer for adjusting end
play is often the No. 1, at the back of the pump.
Remove the thrust washer and measure the
thickness.
8
AEP 3
Lets say that you measured the No. 1 thrust
washer thickness, and it measured 0.072 (inch).
You have too much end play (0.008 -- 0.026) so
you need a thicker washer. 0.072 0.008
0.080, 0.072 0.026 0.098
9
AEP 4
You need a no. 1 thrust washer that is between
0.080 and 0.098. You check the specifications,
and you find that these washers are available
0.0710.076, 0.0780.084, 0.0880.092,
0.0950.099, and 0.1030.107. Many technicians
would choose the 0.0950.099 because it should
set the end play close to the tight-end of the
specifications, which is preferred.
10
AEP 5
Select a new, thicker shim, and install it on the
pump. Replace the pump, and recheck the end play
to make sure that it is correct.
11
Center Supports
Support Assembly
A center support will divide the gear train into
two sections front and back. There will be an
end play adjustment for each section
12
Rear Unit End Play
The dial indicator is set up to measure the end
play as the main shaft is moved in and out. The
adjustment shim is between the center support and
the back of the case.
13
Alternate Measurements
A depth micrometer and special fixture is
measuring down to the top of the gear set. This
measurement will determine the size of the
selective shim/ thrust washer.
14
AM 2
This special fixture with a feeler gauge is
measuring for the selective shim/thrust washer
for this transaxle.
15
AM 3
A special tool is used to lift the gear train
while the end play is measured.
Special Tool
16
AM 4
Special Tool
This special tool clamps onto the input shaft to
provide a handle to lift the shaft. It also holds
the dial indicator.
17
AM 5
The differential end play is being measured on
this transaxle. A special tool connects the dial
indicator to the differential while another
special tool is used to lift the differential.
Special Tools
18
AM 6
The feeler gauge is measuring the gear set end
play/clearance. Excessive clearance indicates
that the thrust washers are worn.
19
Measuring Preload
Preload is normally measured using an inch-pound
torque wrench. A beam-type wrench lets you read
the rolling torque.
20
MP 2
Preload measurement must be read while the
differential is rotating. A reading that is less
than the specifications indicates the bearings
are loose.
21
MP 3
If this differential has bearing clearance, a
measurement of the amount of end play can help
you determine the size for the selective shim. A
pair of screwdrivers is used to lift the
differential.
22
Adjusting Preload
This transaxle bearing retainer is removed so the
shim under the bearing cup can be changed. A
thicker shim will increase preload.
Bearing Selective Bearing Retainer Shim
Cup
23
AP 2
After changing the shim, recheck the preload to
make sure that it is correct.