Toro Reelmaster 6500–D Service Manual page 132

Disassembly – Servo Controlled Piston Pump
The following instructions apply to a single servo con-
trolled piston pump with or without a gerotor charge
pump. A tandem pump assembly should be separated
into individual pumps before disassembly.
1. Position the pump into a protected jaw vise, clamping
onto the outer portion of the flange, with the cap screws
up. Mark the relationship of the working ports (for reas-
sembly identification) to the servo control assembly with
a scribe. Remove the four screws retaining backplate
(14, 21).
2. Lift the charge pump adapter assembly (12) straight
up off backplate (8) and shaft (56).
3. Remove o–ring (11) from charge pump adapter (12).
4. Remove the coupler (10) from shaft (56).
5. Lift backplate (8) straight up off shaft (56) and housing
(58). Remove valve plate (1) from backplate (8) or from
rotating kit assembly (35), still in housing (58).
6. From backplate (8), remove dump valve retaining ring
(4), dump valve plug (5), and relief valve assemblies (7).
Note: Mark the relief valve in relationship to the cavity it
was removed, for reassembly purposes.
Backplate Inspection:
 Check the bearing (2) (press fit) in backplate (8). If
needles remain in cage, move freely, and setting is at
the dimension shown in Figure 23, removal not re-
quired.
 Check roll pin (22) in backplate (8). If tight and set to
the dimension shown in Figure 23, removal not re-
quired.
Figure 23
Hydraulic System
7. Remove housing gasket (34) from housing (58) or
backplate (8).
8. With pump still in vise, remove the six cap screws (30)
retaining the manual servo control assembly (65). Re-
move the control assembly and control housing gasket
(62) from the housing. Remove orifice plates, noting
location for reassembly. Remove nut (28) and lock
washer (66) from control arm (29), remove arm. Note
position of control arm for reassembly.
9. To remove rotating kit assembly (35) from housing
(58), first remove pump from vise holding the rotating kit
assembly in position. Lower pump so that the shaft end
(flange end) is up. Set the rear of housing onto table with
housing flat and rotating kit assembly at rest on table.
(Hole in table, for protruding shaft, is required.) Lift and
remove the housing (58) and shaft (56) from rotating kit
assembly (35), and camplate (36).
10. Remove camplate (36) from rotating kit assembly
(35) and servo piston follower (33) from camplate (36).
Camplate Inspection:
 The finish on the piston shoe surfaces of the camplate
(36) should show no signs of scoring.
 Inspect camplate bushing (37) surface for wear and
surface for coating transfer from bushing.
11. To remove servo piston assembly (41) from housing
(58), start with the four each cap screws (45) and wash-
ers (44) retaining each cover plate (43 & 59).
12. In removing the cover plate (43) from the servo pis-
ton bolt, remove jam nut (46), washer (47), and seal
washer (48). Hold the servo Diston bolt with hex key and
unscrew cover plate (43) off of bolt.
13. Remove servo piston assembly (41) and seal sub–
assemblies (two sets) (49) from housing. Note: Disas-
sembly of servo piston assembly is not required.
14. Remove retaining ring (55) from the front of housing
(58). Press the shaft (56), shaft seal (54), and washer
(53) from housing. Remove retaining ring (50), thrust
washer (51), thrust bearing (52), second thrust washer
(51), and second retaining ring (53) from shaft (56).
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Reelmaster 6500–D/6700–D