Groundsmaster 4000--D/4010--D Hydraulic SystemPage 4 -- 71
4. With ignition switch in the ON position (engine not
running),useDiagnostic Displaytomakesurethatneu-
tral switch is closed when traction pedal is released to
theneutraldetentposition(seeDiagnosticDisplayinthe
Troubleshooting section of Chapter 5 -- Electrical Sys-
tem).
Adjustments with Engine Running
CAUTION
Allwheelswillbeoffthegroundandrotatingdur-
ing the following procedure. Make sure machine
is supported so it will not move and accidentally
fall to prevent injuring a nyone near the machine.
1. Raise and support machine so all wheels are off the
ground(seeJackingInstructionsinChapter1 -- Safety).
2. Start engine and make sure that Hi/Low switch is in
theLow(4WD)position.Depress tractionpedaltoallow
oilflowthroughthetractioncircuit.Allowallwheelstoro-
tate to warm up the hydraulic oil.
3. The traction pedal should contact the pedal stop
when fully depressed. At this point, the piston pump
should be at full stroke.
4. When traction pedal is released from either forward
or reverse, pedal should return to the neutral position
and wheels should stop rotating. If necessary, adjust
spring shaft (item 5 in Fig. 56) until neutral operation is
correct.
5. With the engine running, the transport cylinder on
engine should extend when Hi/Low speed switch is
movedtotheHispeed(2WD)position.This cylinderex-
tensionprevents thepiston (traction)pump swashplate
fromreachingfullstroke when in Hi speed (2WD). Also,
the traction pedal should not contact the pedal stop
when fully depressed in Hi speed (2WD).
6. Adjust the transport cylinder as follows (Fig. 57):
A. PlaceHi/LowspeedswitchintheH ispeed(2WD)
position.
B. Lock one front wheel by applying the wheel
brake.
C. Use a phototac to measure the other front wheel
speed. When the traction pedal is fully depressed to
forward, the wheel speed should be from 370 to 422
RPM.
D. If wheel speed is incorrect, adjust cap screw in
transport cylinder to provide correct wheel speed.
Make sure that jam nut is tightened after any adjust-
ment.
7. Shut engine off.
8. Afteradjustmentshavebeenmadeandallfasteners
aretightened, makesurethattraction roddoes not con-
tact anything through both forward and reverse direc-
tions.
9. Lower machine to ground.
1. Pedal stop height
2. Traction pump end
3. Rod end dimension
4. Traction lever end
5. Neutral adjustment
Figure 56
1
2
3
4
5
1. Transport cylinder
2. Pump control arm
3. Cap screw
4. Jam nut
Figure 57
1
3
2
4
Hydraulic
System
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