Removal (Fig. 45)
Park machine on a level surface, lower cutting
decks, stop engine, engage parking brake, and remove
key from the ignition switch.
Installation (Fig. 45)
1.
1. Carefully lower piston pump into the machine and
position it to the engine adapter plate. Support pump to
prevent it from falling while installing two (2) cap screws
and washers securing piston pump to engine adapter
plate. Torque screws from 85 to 95 ft--lb (115 to 128
N--m).
2.
pump removal, thoroughly clean exterior of pump as-
sembly.
To prevent contamination of hydraulic system during
2.
Installation in the Service and Repairs section of this
chapter).
Install gear pump to piston pump (see Gear Pump
3.
pump by removing lock nut, spacer, and cap screw.
Remove traction rod from control arm on piston
4.
pump.
Disconnect two wires from neutral switch on traction
3.
by installing cap screw, spacer, and lock nut.
Position traction rod to control arm on piston pump
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
4.
pump.
Connect two wires to neutral switch on traction
5.
Remove plugs or caps from disconnected hydraulic
6.
Put a drain pan below the pump assembly. Remove
hoses and open ports of the pump assembly. Install fit-
tings and hoses to correct location on gear and piston
pumps.
hydraulic hoses and fittings connected to piston and
gear pumps. Putplugs orcaps on disconnected hydrau-
lic hoses to prevent contamination of the system. Put
plugs in open ports of pumps.
6. Install new hydraulic oil filter and fill hydraulic reser-
voir with correct oil.
7.
Remove gear pump from machine (see Gear Pump
Removal). Note: If fuel tank is loosened and raised
approximately 4” (102 mm) from the machine, the gear
pump and piston pump can be removed as a complete
assembly.
7. Disconnect engine run solenoid electrical connector
to prevent engine from starting. Prime hydraulic pumps
by turning ignition key switch to start and crank engine
for 15 seconds. Wait 15 seconds and repeat cranking
procedure again.
8.
Support the piston pump to prevent it from falling
while removing two (2) cap screws and washers retain-
ing pump assembly to engine adapter plate. Carefully
pull pump assembly from adapter plate and raise it out
of the machine.
8. Connect engine run solenoid electrical connector,
start the engine, and check for proper operation.
9.
Properly fill hydraulic system (see Charge Hydraulic
System in the Service and Repairs section of this chap-
ter).
10.Stop
engine and check for hydraulic oil leaks. Check
hydraulic reservoir oil level.
Groundsmaster 4100--D
Page 4 -- 59
Hydraulic System
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