Piston Pump Removal (Fig. 51)
Park machine on a level surface, lower cutting units,
stop engine, engage parking brake and remove key
from the ignition switch.
11.If hydraulic fittings are to be removed from piston
pump, mark fitting orientation to allow correct assembly.
Remove hydraulic fittings and o--rings from the piston
pump as needed.
1.
12.Remove
pulley from the taper lock bushing:
2.
Remove traction belt from the pulley (see Traction
Unit Operator’s Manual).
A. Remove three (3) cap screws (item 36) and lock
washers (item 37) securing pulley to the taper lock
bushing.
3.
Remove neutral arm assembly from the piston pump
(see Neutral Arm Assembly Removal in this section).
IMPORTANT: Excessive or unequal pressure on
the cap screws can break the bushing flange.
4.
Unit Operator’s Manual).
Drain hydraulic oil from Hydraulic tank (see Traction
B. Insert cap screws into threaded removal holes of
the pulley. Tighten screws progressively and evenly
until the pulley is loose on the bushing. Remove
pulley from the bushing.
5.
pistonpumptopreventhydraulicsystemcontamination.
Thoroughlycleanhydraulichoseendsandfittingson
WARNING
13.Loosen
set screw that secures taper lock bushing to
piston pump. Remove bushing from the pump shaft. Lo-
cate and retrieve key from pump shaft.
Before disconnecting or performing any work
on the hydraulic system, all pressure in the
system must be relieved. See Relieving Hy-
draulic System Pressure in the General Infor-
mation section.
14.Remove
both cap screws (item 26) and washers
(item 10) thatsecure pistonpump topump support (item
Locate and retrieve spacers (item 29).
28).
15.Remove
locknuts(item4),flatwashers(item46)and
cap screws (item 3) that secure the piston pump to the
pump mount plate. Remove pump from plate.
6.
purposes.
Label all hydraulic hoses and fittings for assembly
Piston Pump Installation (Figs. 51)
7.
Disconnect all hydraulic hoses connected to the hy-
draulic fittings on the piston and gear pumps. Allow
hoses todraininto asuitable container.Plug hoseopen-
ings to prevent contamination.
1.
platewithflatwashers(item46),capscrews(item3)and
lock nuts (item 4).
Position and secure piston pump to the pump mount
CAUTION
Support piston and gear pumps when removing
them from the pump support and pump mount
plate to prevent them from falling and causing
personal injury.
1
8.
flangenuts(item25)thatsecure pumpsupport(item28)
to engine mount (item 58).
Remove both flange head screws (item 27) and
3
6
9.
Remove fasteners and spacers securing the pump
mount plate to the engine (Fig. 52). Note location of cap
screws, washers and spacers for assembly purposes.
Pull pump mount plate with pumps, pump pulley, pump
support and idler assembly from the machine.
1
4
5
2
3
10.Remove
both cap screws (item 56) and flat washers
Figure 52
(item 55) securing gear pump to the piston pump. Sepa-
rate gear pump from the piston pump. Locate and re-
trieve o--ring (item 54). Plug openings of gear pump to
prevent contamination.
1.
2.
3.
Long spacer (4 used)
Flat washer (3 used)
Cap screw (4 used)
4.
5.
6.
Flat washer
Cap screw
Short spacer
Groundsmaster 3505--D
Page 4 -- 81
Hydraulic System
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