Toro Greensmaster 3120 Service Manual page 94

Traction Circuit Testing – Traction Pump (P1) Flow and Relief
Pressure Test (continued)
Hydraulic System: Testing the Hydraulic System
The traction pump flow test is the third in a series of tests recommended to
determine traction circuit performance. The final traction circuit test is verifying
the traction pump relief valve operation. The traction pump flow test compares
fluid flow at No Load with fluid flow Under Load. A drop in flow under load
of more than 12% indicates an internal leak or malfunctioning relief valve in
the traction pump. A worn traction pump or malfunctioning relief valve is less
efficient. Eventually, enough fluid by−pass will cause the unit to stall under
heavy load conditions. Continued operation can generate excessive heat, cause
damage to seals and other components in the hydraulic system, and affect
overall machine performance.
Special Equipment Required:
•
Flow Meter with Pressure Gauge that has at least a 57 LPM (15 GPM)
capacity.
•
Phototach (non−contact tachometer).
1. Park machine on a level surface. The engine should be OFF.
2. Read and adhere to the information provided in
(page 4–35).
3. Make sure that traction pedal is adjusted to the neutral position.
Review and follow Jacking Instructions (page 1–7)
up the machine.
4. Raise both front wheels off the floor and support the machine.
g215375
1. Traction pump
WARNING
Figure 34
2. Hose from traction pump "A" port
Page 4–48
Testing the Hydraulic System
before jacking
Greensmaster 3120
17230SL Rev C