16-21.PISTON PUMP - REPAIR (Contd)
d. Use tapered feeler gauge to
measure opening between valve
block (3) and housing (6).Four
measurements should be obtained
equidistant around unit. Average
four readings by adding them
together and dividing by 4.
Calculate thickness of shaft
bearing spacer as shown in the
+ 0.150 in. = Measured thickness
of bearing spacer
- 0.027 in. = Average gap
+ 0.003 +
0.001 in. = Preload setting
+ 0.020 in. = Compressed
thickness of gasket
0.146 + 0.001 in. = Required
bearing spacer thickness to
provide a 0.003 + 0.001 in.
e. Remove the six mounting screws
(8), then remove housing (6) from
valve block (3).
f. Remove bearing (13) and thickest
bearing spacer (14) from shaft
g. Locate bearing spacer (14) in kit
with dimensions calculated in
step d above. Place spacer (14)
next to the new bearing (13) on
shaft (15), with chamfer of
spacer facing the shaft shoulder.
Use the original spacer (14) and
bearing (13) if preload is not
required. Set aside until final
assembly is performed.