Disassembly Of Sundstrand Tandem Pump - Toro Reelmaster 335-D Service Manual

Disassembly of Sundstrand Tandem Pump

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1. Capscrew
2. Washer
3. Pump housing
4. Pump housing
5. Center section
6. Gasket
7. Alignment pin
8. Valve plate (L.H.)
Cleanliness is a primary way of getting satisfactory
transmission life, on either new or repair units. Cleaning
parts by using a clean solvent wash and air drying is
usually adequate. As with any precision equipment, all
parts must be kept free of foreign materials and chemi­
cals. Protect all sealing surfaces and open cavities from
damage and foreign material.
During assembly of the pump, all surfaces which have
relative motion between two parts should be coated with
a film of clean hydraulic oil. This will assure that these
surfaces will be lubricated during start-up.
It is recommended that all gaskets, o-rings and seals be
replaced. Lightly lubricate all o-rings with clean petro­
leum jelly before assembly. All gasket sealing surfaces
must be cleaned before installing new gaskets.
1. Before performing major repairs on the pump, remove
external components as described in previous proce­
dures. These include the Charge Check / High Pressure
Relief Valves and Charge Relief Valve.
Sundstrand Tandem Pump Repairs
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9. Valve plate (R.H.)
10. Valve plate pin
11. Cylinder block assembly
12. Pistons
13. Slipper guide
14. Piston block
15. Thrust plate
16. Drive shaft
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Figure 32
2. Remove four (4) screws which retain each pump
section to center section.
3. Remove housings from center section.
IMPORTANT: The valve plates may stick to the cen ­
ter section. Do not allow valve plates to fall from
center section.
4. Remove gaskets and alignment pins from center
section.
NOTE: Since the tandem pump sections are mounted
"back-to-back", each section will have a different valve
plate installed. Note the position of each valve plate for
proper installation during assembly of the tandem
pump.
IMPORTANT: Be careful not to damage valve plate
and center section surfaces.
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17. Bearing
18. Retaining ring
19. Drive shaft
20. Bearing
21. Retaining ring
22. Retaining ring
23. Swash plate
24. Needle bearing
25. Drive coupling
Reelmaster
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®
335-D