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Groundsmaster 4100--D/4110--D Hydraulic SystemPage 4 -- 73
Charge Hydraulic System
NOTE: When initially starting the hydraulic system with
new or rebuilt components such as motors, pumps or lift
cylinders, it is important that the hydraulic system be
charged properly. Air must be purged from the system
to reduce the chance of component damage.
IMPORTANT: Change hydraulic oil filters whenever
hydraulic components are repaired or replaced.
1. Park machine on a level surface. Lower cutting deck,
stop engine and apply parking brake. Remove key from
the ignition switch.
2. Make sure all hydraulic connections, lines and com-
ponents are secured tightly.
3. If hydraulic component failure was severe or the hy-
draulic system is contaminated, flush and refill hydraulic
system and hydraulic reservoir ( see Flush Hydraulic
System in this section).
IMPORTANT: When filling hydraulic reservoir, use
only hydraulic fluids specified in Operator’s Manu-
al. Other fluids could cause system damage.
4. Make sure hydraulic reservoir is full. Add correct hy-
draulic oil to reservoir if necessary.
5. Prime hydraulic pumps (see Priming Hydraulic
Pumps in this section).
WARNING
Before jacking up the machine, review and f ollow
Jacking Instructions in Chapter 1 -- Safety.
6. Raise machine so that all wheels are off the ground
and place a ppropriate jack stands under the frame to
support the machine.
IMPORTANT: During initial operation, check hy-
draulic reservoir oil level frequently and add oil as
necessary.
7. Make sure traction pedal and lift switches are in neu-
tral. Start engine and run at low idle speed. The gear
pump should pick up oil and fill the hydraulic system. If
there is no indication of fill in thirty (30)seconds, stop the
engine and determine the cause.
8. After the hydraulic system starts to show signs of fill,
actuate a lift switch until the lift cylinder rod moves in and
out several times. If the lift cylinder does not move after
10 to 15 seconds, or if the pump emits abnormal
sounds, shut the engine off immediately and determine
cause or problem. Inspect for the following:
A. Loose filter or suction lines.
B. Blocked suction line.
C. Faulty charge relief valve.
D. Faulty gear pump.
9. Once the lift cylinder does move in 10 to 15 se-
conds, proceed to the next step.
10.Operate thetraction pedal in the forward and reverse
directions. The wheels should rotate in the proper direc-
tion.
A. If the wheels rotate in the wrong direction, stop
engine and check for proper hydraulic hose and
electrical connections at traction pump and motors.
Correct as needed.
B. If the wheels rotate in the proper direction, stop
engine.
11.Check operation of the traction interlock s witch (see
Check Interlock System in Chapter 5 -- Electrical Sys-
tem).
12.With engine not running and ignition switch in the
OFF position, remove jack stands that are supporting
the machine and lower the machine to the ground.
13.If the piston (traction) pump or a traction motor was
replaced or rebuilt, run the machine so all wheels turn
slowly for ten (10) minutes.
14.Operate machine by gradually increasing its work
load to full over a ten (10) minute period.
15.Stop the machine. Check hydraulic reservoir and fill
if necessary. Check hydraulic components for leaks and
tighten any loose connections.
Hydraulic
System