Procedure for Piston Pump (P3) Flow and Traction
Relief Pressure Test:
13.Verify traction relief valve setting byclosing flowcon-
trol valve on tester. System pressure should be 3500
PSI as the relief valve lifts. If pressure can not be met or
is exceeded with traction pedal fully depressed, release
traction pedal and open flow control valve fully.
1.
Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately 10
minutes.
14.If
specification is not met consider the following:
2.
Parkmachineonalevelsurfacewiththecuttingunits
lowered and off. Make sure engine is off.
A. The traction belt may be worn and slipping (see
Replace Traction Belt).
3.
4.
Read Precautions for Hydraulic Testing.
B. The relief valve leaks or is faulty and needs re-
placement.
Make sure that traction pedal is adjusted to the neu-
tral position (see Adjust Traction Drive for Neutral in the
Adjustments Section).
C. The hydrostat needs to be repaired or replaced
as necessary.
CAUTION
15.If the traction relief valve tests out properly, verify
pump flow as follows:
A. Apply traction pedal until pressure gauge reads
1000 PSI. Verify with a phototac that the pump
speed is 2350 RPM (engine speed approximately
2450 RPM).
One front wheel and the rear wheel will be off the
ground during testing. Make sure machine is
supported so it will not move and accidentally
fall to prevent injuring anyone under machine.
B. Observe flow gauge. TESTER READING should
be approximately 12.5 GPM.
5.
Block up one front traction wheel and the rear wheel
off the floor to allow flow through the traction circuit; dis-
connect brake linkage to the raised front wheel (see
Wheels and Brakes -- Chapter 7).
16.Release
traction pedal and turn off machine.
Note:
If pressure is good under no load, but drops be-
6.
of the machine.
Chock remaining front wheel to prevent movement
low specification when under traction load, the piston
pump and/or wheel motor(s) should be suspected of
wear. When a pump and/or motor is worn or damaged,
thechargepumpisnotabletokeepupwithinternalleak-
age in the traction circuit (See Test #3).
7.
and something immovable in the shop.
Attachaheavychaintotherearofthemachineframe
8.
9.
Make sure parking brake is on.
17.If
be repaired or replaced as necessary.
specifications are not met, the hydrostat needs to
Disconnect hose from the lower hydraulic fitting on
the engine side of the hydrostat (Fig. 18).
18.Disconnect
tester from hydraulic fitting and hose.
10.Install
tester in series with the pump and the discon-
Reconnect hose to pump connection.
nected hose. Make sure the tester flow control valve is
fully open.
19.Reconnect
Brakes -- Chapter 7).
brake linkage to wheel (see Wheels and
11.
50
Start engine and move throttle to full speed (3050 +
RPM).
CAUTION
2
Use extreme caution when taking gauge read-
ings. The front tire on the ground will be trying to
move the machine forward.
1
12.Slowly
push traction pedal fully to forward position.
Figure 18
1.
Lower hydraulic fitting
2.
Piston pump
Groundsmaster 3500--D
Page 4 -- 33
Hydraulic System (Rev. D)
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
|---|---|
| Tags | Toro Groundsmaster 3500 D |
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| Language | English |
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