16-21.PISTON PUMP - REPAIR (Contd)
b. Measure face thickness of each
shoe. The face thickness of all
shoes must be within 0.001 inches
of each other.
7. INSPECT CYLINDER BLOCK (17).
a. Inspect cylinder block bore for
wear, scratches, and/or erosion
between cylinders. Check the
spring, washers, and retaining
ring located within the cylinder
block for wear.
b. Check each cylinder block bore
for excessive wear by sliding the
piston and shoe subassemblies
through the bores. If binding is
evident, clean cylinder block and
piston, lubricate parts with
clean hydraulic fluid and again
check for binding.
8. INSPECT CHECK VALVE (43).
a. Press check valve (43) against
spring (44).Valve (43) should
return and hold firm against seat
b. If replacement is necessary,
spring (44), valve (43), and seat
(42) must be replaced as a set.
1. IF REMOVED, INSTALL TWO PLUGS (50) TO
2. IF REMOVED, INSTALL ALIGNMENT PINS
(49) INTO HOUSING (6).
3. INSTALL NEW DRIVE SHAFT BEARING (38)
AND SEAL (41).
a. Use fabricated tool (App. C, Fig.
C-12) and an arbor press to press
shaft (15) through bearing (38).
Press shaft until bearing (38)
bottoms against drive shaft (15)