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TM 10-3930-660-24-2
PISTON PUMP MAINTENANCE - CONTINUED
0256 00
ASSEMBLY - CONTINUED
21.
With spacer (33) fully installed against bearing race (30), measure height of spacer with respect to the housing pintle
face using a micrometer. Take measurements in two places, 180 degrees apart.
22.
Average the two readings taken in step 23 above to
PINTLE
obtain a nominal value.
BEARING
SPACER
NOTE
A 0.007 to 0.009 in. (0.177 to 0.228 mm)
preload is required on the pintle bearings.
23.
Determine the number of shims required to obtain a
preload between 0.007 and 0.009 in. (0.177 to 0.228
mm) by subtracting the nominal preload (0.008 [0.203
mm]) from the calculated nominal valve (step 24).
PINTLE
FACE
409-1484
Example: Let's assume the depth readings were 0.029 and 0.027 in. (0.736 and 0.685 mm). Add these two figures
together and divide by two to obtain the average (nominal value):
0.029 + 0.027 = 0.056 in. (0.736 + 0.685 = 1.421 mm)
0.056/2 = 0.028 (1.421/2 = 0.710 mm) (nominal calculated valve)
Nominal Calculated Value - Nominal Preload Value = Required Shim Thickness
0.028 - 0.008 = 0.020 in. (0.711 - 0.203 = 0.508 mm) of shim thickness
NOTE
If calculated shim thickness is greater than 0.020 in. (0.508 mm), another shim must be added to the opposite
side of the yoke to reduce total shim thickness to less than 0.020 (0.508 mm). Shim thickness at either pintle
must not exceed 0.020 in. (0.508 mm). This is necessary to provide proper O-ring compression and prevent
pintle seal leakage.
0256 00-8

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