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Groundsmaster 4000--D Hydraulic System (Rev. B)Page 4 -- 53
Removal
1. Park machine on a level surface, lower cutting units,
stop engine, engage parking brake, and remove key
from the ignition switch.
2. Raise seat and secure it with prop rod to gain access
to gear pump.
3. Drain the hydraulic reservoir (see Operator’s Manu-
al).
4. To prevent contamination of hydraulic system during
removal, thoroughly clean exterior of pump and fittings.
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. Disconnect hydraulic lines from pump and put caps
or plugs on open hydraulic lines and fittings. Label dis-
connected hydraulic lines for proper reassembly.
7. Support gear pump assembly to prevent it from fal-
ling.
8. Remove two (2) cap screws and washers securing
gear pump to piston pump. Remove gear pump, cou-
pler, spacer, and o--rings from machine.
Installation
1. Lubricate new o--rings with clean hydraulic oil and
position on pump.
2. Slide coupler onto the piston pump output shaft.
3. Position o--rings and spacer to gear pump. Align
gear teeth and slide gear pump input shaft into coupler.
Secure gear pump to piston pump with two (2) cap
screws and washers.
4. Remove caps or plugs from hydraulic lines and fit-
tings. Install lines to gear pump.
5. Replace hydraulic filter and fill hydraulic reservoir
with new hydraulic oil.
6. Disconnect engine run solenoid electrical connector
to prevent engine from starting. Prime the hydraulic
pump by turning the ignition key switch to start and crank
the engine for 10 seconds. Repeat cranking procedure
again.
7. Connect engine run solenoid electrical connector,
start the engine and check for proper operation.
8. Properly fill hydraulic system (see Charge Hydraulic
System).
9. Stop engine and check for hydraulic oil leaks. Check
hydraulic reservoir oil level.
Hydraulic
System