Removal (Fig. 49)
Park machine on a level surface, lower cutting
decks, stop engine, apply parking brake and remove
key from the ignition switch.
Installation (Fig. 49)
1.
1. If fittings were removed from gear pump, lubricate
and place new O--rings onto fittings. Install fittings into
pump openings using marks made during the removal
process to properly orientate fittings. Tighten fittings
(see Hydraulic Fitting Installation in the General Infor-
mation section of this chapter).
2.
Raise seat and secure it with prop rod to gain access
to gear pump.
3.
4.
Drain the hydraulic reservoir.
A. If 90o hydraulic suction fitting (item 8) was re-
moved, torque fitting nut from 103 to 118 ft--lb (140
to 160 N--m).
To prevent contamination of hydraulic system during
removal, thoroughly clean exterior of pump and fittings.
2.
oil. Position O--rings on gear pump and pump spacer
flanges.
Lubricate new O--rings(item 13)with cleanhydraulic
5.
Installing Hydraulic System Components at the begin-
ning of the Service and Repairs section of this chapter.
Read the General Precautions for Removing and
3.
4.
and slide gear pump input shaft into coupler. Secure
gear pump to piston pump with two (2) cap screws and
flat washers. Torque screws from 79 to 84 ft--lb (108 to
Slide coupler onto the piston pump output shaft.
Position pump spacer to gear pump. Align gearteeth
6.
or plugs on open hydraulic lines and fittings. Label dis-
connected hydraulic lines for proper installation.
Disconnect hydraulic lines from pump and put caps
7.
ling.
Support gear pump assembly to prevent it from fal-
113
N--m).
8.
gear pump to piston pump. Remove gear pump, cou-
pler, spacer and O--rings from machine.
Remove two (2) cap screws and washers securing
5.
Remove caps or plugs from hydraulic lines and fit-
tings.Installlinestogearpump(seeHydraulic Hoseand
Tube Installation in the General Information section of
this chapter).
9.
If hydraulic fittings are to be removed from gear
pump, mark fitting orientation to allow correct assembly.
Remove fittings from pump and discard O--rings.
6.
with new hydraulic oil.
Replace hydraulic filter and fill hydraulic reservoir
7.
Disconnect engine run solenoid electrical connector
to prevent engine from starting. Prime the hydraulic
pump by turning the ignition key switch to start and
cranking the engine for ten (10) seconds. Repeat crank-
ing procedure again.
8.
start the engine and check for proper operation.
Connect engine run solenoid electrical connector,
9.
Properly fill hydraulic system (see Charge Hydraulic
System in this section).
10.Stop
engine and check for hydraulic oil leaks. Check
hydraulic reservoir oil level.
11.
Lower and secure seat.
Groundsmaster 4000--D
Page 4 -- 69
Hydraulic System
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