TM 5-5420-202-34
FUEL PRIMER PUMP PISTON ROD ASSEMBLY REPAIR (Sheet 2 of 3)
CLEANING AND INSPECTION:
1.
Clean all parts of piston assembly as required.
2.
Using an inside and outside micrometer, check parts for wear as indicated. Replace all
parts that do not meet wear limits.
PRIMER PUMP WEAR LIMITS
Wear
Size and fit
Point of
Reference
Limits
Letter
Measurement
of New Parts
0.256
0.248 to 0.253
A
ID of clevis bore
0.008L
0.000 to 0.010L
Fit of pin in yoke
B
(*)
0.497 to 0.499
OD of piston rod
C
(*)
0.505 to 0.507
ID of gland
D
(*)
0.006L to 0.010L
Fit of rod in gland
C-D
(*)
0.990 to 0.995
E
OD of piston
An asterisk (*) in the wear limits column indicates part should be replaced when worn
beyond limits given in size and fit of new parts column.
An L following a dimension indicates loose fit.
Inspect all parts for cracks or deformities. Replace as required.
3.
Go on to Sheet 3
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