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Groundsmaster 4000--D Hydraulic System (Rev. B)Page 4 -- 59
Removal
1. Park machine on a level surface, lower cutting units,
stop engine, engage parking brake, and remove key
from the ignition switch.
2. To prevent contamination of hydraulic system during
removal, thoroughly clean exterior of pump assembly.
3. Remove traction rod from control arm on piston
pump by removing lock nut, spacer and cap screw.
4. Disconnect two wires from neutral switch on traction
pump.
5. Read the General Precautions for Removing and
Installing Hydraulic System Components at the begin-
ning of the Service and Repairs section of this chapter.
6. Put a drain pan below the pump assembly. Remove
hydraulic hoses and fittings connected to piston and
gear pumps. Putplugs or caps on disconnected hydrau-
lic hoses to prevent contamination of the system. Put
plugs in open ports of pumps.
7. Remove gear pump from machine (see Gear Pump
Removal). Note: If fuel tank is loosened and raised from
the machine, the gear pump and piston pump can be re-
moved as a complete assembly.
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.
Installation
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. Install gear pump to piston pump (see Gear Pump
Installation).
3. Position traction rod to control arm on piston pump
by installing cap screw, spacer and lock nut.
4. Connect two wires to neutral switch on traction
pump.
5. Remove plugs or caps from disconnected hydraulic
hoses and open ports of the pump assembly. Install fit-
tings and hoses to correct location on gear and piston
pumps.
6. Install new filter and fill hydraulic reservoir with cor-
rect oil.
7. Disconnect engine run solenoid electrical connector
to prevent engine from starting. Prime pumps by turning
ignition key switch to crank engine for 10 seconds. Re-
peat cranking procedure again.
8. Connect engine run solenoid electrical connector,
start the engine, and check for proper operation.
9. Properly fill hydraulic system (see Charge Hydraulic
System).
10.Stop engine and check for hydraulic oil leaks. Check
hydraulic reservoir oil level.
Hydraulic
System