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Groundsmaster 4100--D Hydraulic SystemPage 4 -- 55
Procedure for Steering and Lift/Lower Gear Pump
Flow Test
Output from the steering and lift/lower gear pump sec-
tion is equally divided by a proportional valve to provide
flow to the steering circuit and the lift circuit. To test gear
pump flow, testing of both steering and lift/lower circuits
is required. Total gear pump flow is the combined flow
from the two c ircuits.
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
2. Parkmachineon a level surface with thecuttingdeck
lowered and off. Make sure engine is off and the parking
brake is engaged. Raise seat.
CAUTION
Prevent personal injury and/or damage to equip-
ment. Read all WARNINGS, CAUTIONS and Pre-
cautions for Hydraulic Testing at the beginning
of this section.
IMPORTANT: Make sure that the oil flow indicator
arrow on the flow gauge is showing that the oil will
flow from the pump section, through the tester and
into the hydraulic hose.
3. Withtheengineoff and cuttingdecklowered,discon-
nect the hydraulic hose from the 90
o
fitting in the third
gear pump section which supplies the steering and lift/
lower circuits ( Fig. 43).
4. Install tester in series between the fitting and the dis-
connected hose. Make sure the tester flow control valve
is OPEN.
IMPORTANT: The pump is a positive displacement
type. If pump flow is completely restricted or
stopped, damage to the pump, tester or other com -
ponents could occur.
5. Starttheengine and move throttle to full speed(2870
RPM). DO NOT engage the cutting deck.
6. While watching pressure gauges, slowly close flow
control valve until 1000 PSI (69 bar) is obtained on
gauge. Verify engine speed continues to be 2870 RPM.
GAUGE READING TO BE: Flow approximately 7
GPM (26.3 LPM) at 1000 PSI (69 bar).
7. Stop engine and record test results.
8. If a pressure of 1000 PSI (69 bar) could not be ob-
tained or flow is lower than 6GPM(22.3LPM)(85% of
expected flow), check for restriction in pump intake line.
If intake line is not restricted, consider that gear pump is
worn or damaged.
9. When testing is complete, remove tester and recon-
nect hose to pump fitting.
1. Gear pump
2. Fan drive manifold
3. Steering/lift hose
4. 90
o
fitting
Figure 43
1
2
3
4
Hydraulic
System