16-21.PISTON PUKP - REPAIR (Contd)
6. ASSEMBLE VALVE BLOCK.
a. Use fabricated tool (App. C, Fig.
C-14) and an arbor press to
install new bearing race (48).
Press race (48) until it bottoms
against shoulder in valve block
Check flatness of valve block face in
area around locating pin holes (B) and
at mounting screw (A) holes. If
necessary, use an India stone to remove
burrs or raised metal in these areas.
b. Install pipe plug (45) into valve
7. ADJUST SHAFT BEARING PRELOAD.
If the shaft bearings, shaft, valve
block or housing were not replaced, use
the bearing spacer removed during
disassembly to preload the shaft and
perform step g. If any of these items
were replaced, preload adjustment is
The bearing spacer kit contains several
different sizes of bearing spacers
a. Install thickest bearing spacer
(14) over shaft (15), with chamfer
facing into housing (6).
b. Slide bearing (13) onto shaft
(15).Small diameter of bearing
must face out of housing.
c. Temporarily install housing (6)
on valve block (3).Do not
install gasket (10) or rotating
group parts (18) at this time.
Turn shaft (15) to seat bearings,
then tighten six screws (9) to 5