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Groundsmaster 5900/5910 Hydraulic SystemPage 4 -- 43
Procedure for Traction Circuit Relief 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.
Perform Traction Circuit Relief Pressure Test in
an open area, away from people and obstruc-
tions.
CAUTION
2. Drive machine to an open area, lower cutting decks,
turn the engine off and apply the parking brake.
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 10,000 PSI (700 Bar) pressure gauge to
traction circuit test port for function to be checked (Fig.
25).
4. After installing pressure gauge, start engine and run
at idle speed. Check for hydraulic leakage and correct
before proceeding with test.
5. Siton seat and operate theengineatfullspeed(2750
RPM). Release parking brake.
6. Apply service brakes fully and slowly depress the
traction pedalin the appropriate direction (forward or re-
verse). While pushing traction pedal, look at pressure
reading on gauge:
GAUGE READING TO BE:
4230 to 4430 PSI (292 to 305 bar) in forward
5230 to 5430 PSI (361 to 374 bar) in reverse
7. Release traction pedal and stop engine. Record test
results.
8. Iftraction pressure is low,inspecttractionpumprelief
valves (Fig. 25). Clean or replace valves as necessary.
These cartridge type valves are factory set and are not
adjustable. If relief valves are in good condition, traction
pump or wheel motors should be suspected of w ear and
inefficiency.
9. Disconnect pressure gauge from test port.
Figure 25
2
3
1
5
4
1. Forward test port
2. Reverse test port
3. Charge pressure port
4. Forward relief valve
5. Reverse relief valve
Hydraulic
System