Groundsmaster 4100--D Hydraulic SystemPage 4 -- 25
Procedure for Traction Circuit Charge Pressure Test
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. Park machine on a level surface w ith the cutting
decks lowered and off. Make sure engine is off and the
parking brake is engaged.
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.
3. Connect a 1000 PSI gauge onto c harge pressure
test port (Fig. 18) under operator seat.
4. After installing pressure gauge, start engine and run
at idle speed. Check for hydraulic leakage and correct
before proceeding with test.
5. Operate the engine at full engine speed (2730 +
30
RPM) with no load on the hydraulic system.
GAUGE READING TO BE 200 to 300 PSI.
6. Stop engine and record test results.
7. If there is no pressure, or pressure is low, check for
restriction in pump intake line. Also, inspect charge relief
valve located in filter manifold (see Hydraulic Manifold
Service: Filter Manifold in this chapter). If necessary,
check for internal damage or worn parts in gear pump.
8. Also, w ith the pressure gauge still connected to the
charge pressure test port, take a gauge reading while
operating the machine in forward and reverse. Start the
engine and put throttle at full engine speed (2730 +
30
RPM). Apply the brakes and push the traction pedal for-
ward, then reverse.
GAUGE READING TO BE 200 to 300 PSI.
9. If charge pressure is good under no load, but drops
below specification when under traction load, the piston
(traction) pump and/or traction motor(s) should be sus-
pected of wear and inefficiency. When the pump and/or
traction motor(s) are worn or damaged, the charge
pump is not able to keep up with internal leakage in trac-
tion circuit components.
10.Disconnect pressure gauge from test port.
1. Charge pressure port 2. Hydraulic reservoir cap
Figure 18
2
1
Hydraulic
System
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