TM 1-1520-238-23
3-239
3.61.
PARKING BRAKE ROTARY DIRECT VALVE REPAIR AND TEST (AVIM) – continued
g. Check parts for conformance to dimensions listed in Table I.
(1) Minimum and maximum dimensions are ideal limits. Continue to use part if replacement dimension is not
exceeded. Use caliper and caliper.
TABLE I. TABLE OF TOLERANCES
Part Name and
Dimensions (INCHES)
Replacement
Part Name and
Index No.
Measure
Min
Max
Replacement
Dimensions (INCHES)
Piston (19)
OD mating with valve (2)
0.685
0.686
0.6845
Seat (1)
ID mating with lifter (8)
0.1250
0.1255
0.1257
Lifter (8)
OD mating with seat (1)
0.1239
0.1245
0.1238
Cam (9)
OD mating with valve (2)
0.371
0.372
0.3708
Piston (13)
OD mating with cap (14)
OD mating with valve (2)
0.200
0.434
0.201
0.435
0.1995
0.4335
Valve (2)
Bore mating with piston (19)
Bore mating with cam (9)
Bore mating with piston (13)
0.6865
0.374
0.4365
0.6885
0.376
0.4385
0.6890
0.3765
0.4390
h. Check springs for conformance to Table II. Use spring tester.
TABLE II. SPRING TEST CHART
Index No.
Test Length (INCHES)
Test Load
Free Length
(22)
2.696
162.0 to 182.0 POUND
Not controlled
(5)
0.218
3.2 to 4.0 OUNCE
Not controlled
(17)
0.770
3.6 to 5.6 POUND
0.955 to 0.985 INCHES
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