Piston Pump Control Assembly - Toro Groundsmaster
4000?D Service Manual

PRELIMINARY – For Toro Distributor and Toro Company use only.

Piston Pump 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 − Manual Servo Control Assembly
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
7
6
24
23
22
21
20
Figure 46
9. O−ring
10. Wiper seal
11. O−ring
12. Adaptor
13. Ball
14. Pin
15. Neutral switch
16. O−ring
Page 4 − 64
44 to 52 ft−lb
(60 to 70 N−m)
10
9
12
8
18
19
17. Set screw
18. Set screw
19. Pin
20. Retaining ring
21. Feedback link
22. Dowel pin
23. Bell crank
24. Set screw
Assembly − Manual Servo Control Assembly
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
16
17
11
28 to 34 in−lb
(3.2 to 3.8 N−m)
Groundsmaster 4000−D