Toro Greens Aerator, Service Manual

Page: 51 / 130

9. Rotate retaining ring (item 6) so end of ring is at hole
in pump housing. Insert a punch into hole and remove
retaining ring from housing. Remove end plate (item 7)
and pressure plate spring (item 8) from pump housing.
IMPORTANT: When removing pressure plate (item
9), pump ring (item 10) and thrust plate (item 13),
mark components so that they can be assembled in
the same orientation.
10.Lightly tap on end of drive shaft with soft face ham-
mer until pressure plate (item 9) and pump ring (item 10)
are free of pump housing. Remove pressure plate.
11. Remove pump ring (item 10) and rotor vanes (item
12) from rotor.
12.Remove retaining ring (item 21) from pump drive
shaft.
13.Complete pump disassembly by removing rotor
(item 11), thrust plate (item 13), dowel pins (item 16), o–
rings (item 14) and shaft seal (item 22).
Inspection
1. Inspect rotating group components:
A. Inspect rotor vanes for scoring or wear. Also,
check the fit of the vanes into the rotor for sticking or
excessive play.
B. Check rotor slots for burrs or excessive wear at
thrust faces.
C. Inspect inner surface of pump ring for scoring or
excessive wear.
2. Inspect thrust plate and pressure plate for wear or
scoring on thrust surfaces.
3. Inspect drive shaft for scoring or wear.
4. Inspect control valve to make sure it moves freely in
valve bore.
5. Replace any components found to be damaged.
Assembly (Fig. 17)
NOTE: During the assembly process, lightly oil all
pump components with 10W30 engine oil before instal-
ling them.
1. Install two (2) new o–rings (item 14) into pump hous-
ing grooves.
2. Install new shaft seal (item 22) into pump housing.
3. Install two (2) dowels pins (item 16) into pump hous-
ing.
4. Install thrust plate (item 13) onto drive shaft with
countersunk side toward pulley end of shaft. Install rotor
(item 11) onto shaft and secure with new retaining ring
(item 21).
5. Apply coating of 10W30 engine oil to shaft bearing in
pump housing.
6. Install drive shaft assembly into pump housing taking
care to not damage shaft seal. Make sure that dowel
pins positioned in housing extend through holes in thrust
plate.
7. Install rotor vanes (item 12) into rotor making sure
that rounded edges face the pump ring location.
8. Install pump ring (item 10) over vanes and rotor us-
ing identification mark made during disassembly to cor-
rectly position pump ring to thrust plate. Make sure that
dowel pins are located in small holes of pump ring and
thrust plate recesses are aligned with large holes of
pump ring.
9. Install pressure plate (item 9) using identification
mark made during disassembly to correctly position
plate to pump ring.
10.Install pressure plate spring (item 8) and end plate
(item 7). Compress end plate into pump housing to allow
retaining ring (item 6) to be installed. Install retaining
ring to secure pump assembly.
11. Install new o–ring (item 15) and seals (item 17).
IMPORTANT: Take care to not distort pump reser-
voir when installing reservoir to pump housing.
12.Carefully install pump reservoir onto pump housing.
Install mounting studs (item 1) finger tight to retain reser-
voir to pump housing.
13.Install control spring (item 19) and control valve (item
18). Make sure that flat end of control valve faces out-
ward.
14.Place new o–ring (item 4) on hydraulic fitting (item 3).
Thread fitting into pump and torque fitting from 37 to 55
ft–lb (50 to 75 N–m).
15.Torque mounting studs (item 1) from 26 to 59 ft–lb
(35 to 80 N–m).
16.Install pulley onto pump shaft.
Hydraulic
System
Greens Aerator Page 4 – 21 Hydraulic System