Piston Pump Manual Servo Control Assembly - Toro Groundsmaster 4500-D Service Manual

Piston Pump Manual Servo Control Assembly

1
2
3
4
5
4
17 to 26 in- -lb
(2 to 3 N- -m)
1. Plug
2. O- -ring
3. Retaining ring
4. Spring retainer
5. Spring
6. Spool valve
7. Control housing
8. Input shaft
Disassembly
1. Remove wiper seal with screw driver. Remove set
screw (18) that retains input shaft and remove input
shaft from control housing. Remove o--ring from shaft.
2. Remove set screw (24) from plug that retains valve
spool. Remove plug from control housing and o--ring
from plug.
3. Remove retaining ring (20) from pin that retains feed-
back link and spool valve. Remove pin, feedback link,
spool valve, and bell crank from control housing.
4. Compress spring and remove retaining ring (3). Re-
move spring retainer, spring, and second spring retainer
from spool valve.
5. Clean all parts and lubricate in clean hydraulic oil for
reassembly.
Hydraulic System (Rev. A)
7
6
24
23
22
21
Figure 62
9. O- -ring
10. Wiper seal
11. O- -ring
12. Adaptor
13. Ball
14. Pin
15. Neutral switch
16. O- -ring
Page 4 - - 68
44 to 52 ft- -lb
(60 to 70 N- -m)
10
9
8
18
20
19
Reassembly
1. Install spring retainer, spring, and second spring re-
tainer onto spool valve. Compress spring to allow retain-
ing ring (3) to be installed onto spool valve.
2. Install spool valve into control housing making sure
that metering notches on spool valve can be seen in the
metering ports.
3. Position bell crank in housing. Slide feedback link
into position between clevis on valve spool, aligning
holes, and install dowel pin and retaining ring (20).
4. Install new o--ring (9) onto input shaft. Hold bell crank
in position with feedback link slot and align splined hole
of bell crank with input shaft cavity. Install input shaft into
control housing and bell crank.
15
14
13
12
16
17
11
28 to 34 in- -lb
(3.2 to 3.8 N- -m)
17. Set screw
18. Set screw
19. Pin
20. Retaining ring
21. Feedback link
22. Dowel pin
23. Bell crank
24. Set screw
Groundsmaster 4500--D/4700--D