10. Assemble each cylinder block kit by installing piston
assemblies into the slipper guide. Lubricate pistons and
cylinder block bores. Install assembled guide and pis-
tons into cylinder block by inserting pistons into cylinder
block bores. The pistons and bores are not selectively
fitted, so no specific piston and bore orientation is
required.
11. Lay the pump on its side and install cylinder block
k
its into the housing.
12. Install valve plate locating pins into center section.
13. Coat back (steel side) of valve plates with petroleum
je
lly to hold them in position and install valve plates onto
center section, with their bronze faces visible. The notch
on each valve plate must engage its locating pin.
NOTE: Since the tandem pump sections are mounted
“bac
k-to-back”, each section will have a different valve
plate installed.
Figure 34
L.H. plate R.H. plate
14. Install the four (4) alignment pins and install new
gaskets onto center section.
15. Assemble rear pump section onto center section
(with va
lve plate installed). Align drive coupling splines
while assembling. When the sections are properly as-
sembled, cylinder block spring will hold center section
away from housing approximately 1/8 in.
16. Install the four (4) screws and washers that retain
rear
housing to center section and evenly tighten to a
torque of 45 to 54 ft-lb.
IMPORTANT: Be sure all parts are properly aligned.
Do
not force center section into position on
housing.
17. Assemble front pump section onto assembled cen-
ter
and rear section. Align drive coupling splines while
assembling.
18. When the sections are properly assembled, cylinder
b
lock spring will hold center section away from housing
approximately 1/8 in.
IMPORTANT: Be sure all parts are properly aligned.
Do
not force center section into position on
housing.
19. Install the four (4) screws and washers that retain
rear
housing to center section and evenly tighten to a
torque of 45 to 54 ft-lb.
20. Rotate the pump motor shaft to make sure pump is
assembled correctly
. When properly assembled, a
maximum torque of 7 ft-lb should be required to turn
shaft.
21. Assemble the following components as described in
pre
vious procedures:
Charge Check / High Pressure Relief Valves
Charge Relief Valve
Reelmaster
®
335-D Page 4 - 43 Sundstrand Tandem Pump Repairs
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