Filter
Top Products
Groundsmaster 4100--D Hydraulic SystemPage 4 -- 33
ProcedureforTraction CircuitChargePressure 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. Parkmachineon a level surface with thecuttingdeck
lowered and off. Make sure engine is off and the parking
brake is engaged. Raise and support operator 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.
3. Connect a 1000 PSI (70 bar) gauge onto charge
pressure test port (Fig. 21) 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 (2870 RPM)
with no load on the hydraulic system.
GAUGE READING TO BE 200 to 300 PSI (13.8 to
20.6 bar).
6. Stop engine and record test results.
7. If there is no pressure, or pressure is low, check for
restrictioninpump intakeline.Also, inspectchargerelief
valve located in filter manifold (see Hydraulic Manifold
Service: Filter Manifold in the Service and Repairs sec-
tionofthis chapter).If necessary,check forinternal dam-
age or worn parts in gear pump.
8. Also, with 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 (2870 RPM).
Apply the brakes and push the traction pedal forward,
then reverse.
GAUGE READING TO BE 200 to 300 PSI (13.8 to
20.6 bar).
9. If charge pressure is good under no load, but consis-
tently drops below specification when under traction
load, the piston (traction) pump and/or traction motor(s)
should be suspected of wear and inefficiency. When the
pump and/ortractionmotor(s) are worn or damaged,the
charge pump is not able to keep upwith internal leakage
in traction circuit c omponents.
10.When testing is completed, disconnect pressure
gauge from test port.
1. Charge pressure port 2. Filter manifold
Figure 21
1
2
Hydraulic
System