caution - Toro

Procedure for Traction Circuit Charge Pressure Test
1. Make sure hydraulic oil is at normal operating temperature
by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
2. Park machine on a level surface with the cutting deck
lowered and off. Make sure engine is off and the parking
brake is engaged. Raise and support operator seat.
1
CAUTION
Prevent personal injury and/or damage to equipment.
Read all WARNINGS, CAUTIONS and Precautions
for Hydraulic Testing at the beginning
of this section.
2
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
restriction in pump intake line. Also, inspect charge relief
valve located in filter manifold (see Hydraulic Manifold
Service: Filter Manifold in the Service and Repairs section
of this chapter). If necessary, check for internal damage
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 consistently
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/or traction motor(s) are worn or damaged, the
charge pump is not able to keep up with internal leakage
in traction circuit components.
Figure 21
1. Charge pressure port 2. Filter manifold
Hydraulic
System
10.When testing is completed, disconnect pressure
gauge from test port.
Groundsmaster 4100--D
Page 4 - 33
Hydraulic System