Service Manual
Assembly of Sundstrand Tandem Pump
1
23
11
15
13
12
18
14
25
7
23
6
14
10
10
2
11
12
13
15
8
24
24
9
6
4
16
17
5
7
22
21
20
19
1
2
3
Figure 33
1. Capscrew 9. Valve plate (L.H.) 17. Bearing
2. Washer 10. Valve plate pin 18. Retaining ring
3. Pump housing 11. Cylinder block assembly 19. Drive shaft
4. Pump housing 12. Pistons 20. Bearing
5. Center section 13. Slipper guide 21. Retaining ring
6. Gasket 14. Piston block 22. Retaining ring
7. Alignment pin 15. Thrust plate 23. Swash plate
8. Valve plate (R.H.) 16. Drive shaft 24. Needle bearing
25. Drive coupling
1. Clean and lightly oil parts before assembly. Tighten
all threaded parts to recommended torque value.
IMPORTANT: Most parts have critical, high toler-
ance surfaces. Use caution to prevent damage to
these surfaces during assembly. Protect exposed
surfaces, openings and ports from damage and
foreign material.
2. Install swashplate into housing. Make sure swash-
pla
te control shaft is located on correct side of housing
(note marks made during disassembly). Install swash-
plate bearings into housing and onto swashplate trun-
nions.
3. Install trunnion cover (with o-ring and trunnion bear-
ing) int
o housing and over swashplate trunnion.
4. Use an arbor press to press a new seal into trunnion
seal cover. Outer face of seal should be pressed flush
with outer surface of seal cover. Be careful not to
damage the seal.
5. Install trunnion seal cover with o-ring, seal and trun-
nio
n bearing into housing and over swashplate trunnion
(see Trunnion Seal Replacement). Wrap end of swash-
plate control shaft with thin plastic to prevent damage to
seal lip during installation.
6. Install hex tapping screws and tighten to a torque of
6 t
o 9 ft-lb.
7. Using caution to not damage the sealing surface,
press ball bearing onto drive shaft. Install bearing retain-
ing ring onto shaft.
8. Install drive shaft and bearing into housing.
9. Install input shaft seal, seal cover and o-ring as
described in Tandem Pump Shaft Seal Replacement.
Coat thrust plate with petroleum jelly and install onto
swashplate. The thrust plate is reversible.
Sundstrand Tandem Pump Repairs P
age 4 - 42 Reelmaster
®
335-D