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Groundsmaster 3505--DHydraulic System Page 4 -- 82
2. Remove plugs from piston pump openings that were
placed during disassembly. Install hydraulic fittings with
new o-- rings to their original positions on the piston
pump.
NOTE: Ifinstalling anew gearpump to the pistonpump,
make sure to remove the plug from the suction port of
the gear pump (Fig. 53). The gear pump suction fitting
must be on the same side as the trunnion of the piston
pump.
3. Remove plugs that were placed during disassembly
from gear pump openings. Position o--ring (item 54) and
gear pump to thepiston pump and securewith flat wash-
ers (item 55) and cap screws (item 56). Torque cap
screwsfrom27to31ft--lb(37to42N--m).
4. Place key into pump shaft slot. Slide taper lock bush-
ing onto the piston pump shaft with bushing flange to-
ward pump housing.
5. Make sure that tapered surfaces of pulley and taper
lock bushing are thoroughly clean (no oil, grease, dirt,
rust, etc.).
6. Position pulley to taper lock bushing and align non--
threaded holes of pulley with threaded holes of bushing.
Loosely install three (3) cap screws with lock washers to
bushing and pulley.
CAUTION
Support piston and gear pumps when installing
them to the machine to prevent t hem from falling
and causing personal injury.
7. Position pump mount plate with pumps, pump pulley
and idler assembly to the machine. Install fasteners and
spacers securing the pump mount plate to the engine
and pump support (Fig. 52). Tighten fasteners securely.
8. Position and secure pump support (item 28) to pump
mount plate, piston pump and engine mount with re-
moved fasteners and spacers.
9. Install traction belt (see Traction Unit Operator’s
Manual).
10.Using a straight edge across the lower face of the
pump pulley,verify tractionbelt alignmentacross engine
and pump pulleys. Slide pulley and taper lock bushing
on pump shaft so that traction belt and straight edge are
aligned indicating correct position of pump pulley. Se-
cure taper lock bushing in position with set screw.
IMPORTANT: When tightening bushing cap screws,
tighten in three equal steps and in a circular pattern.
11.Securetaper lock bushingby tightening three (3)cap
screws to a torque from 90 to 120 in--lb (10.2 to 13.6
N--m) in three equal steps and in a circular pattern to se-
cure pulley and taper lock bushing.
12.Check that belt alignment is still correct. If needed,
loosen andre--adjust pulleyand taperlock bushingloca-
tion on pump shaft to allow for correct belt alignment.
13.Remove plugs that were placed during disassembly
from hydraulic hoses. Connect all hydraulic hoses with
new o --r ings to piston and gear pumps.
14.Install neutral arm assembly to the piston pump (see
Neutral Arm Assembly Installation in this section).
15.Fill hydraulic tank with new hydraulic fluid (see Trac-
tion Unit Operator’s Manual).
16.Adjust traction drive for neutral (see Traction Unit
Operator’s Manual).
Figure 53
1. Gear pump 2. Suction port
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1