Testing The Traction Circuit - Hydraulic Pump Flow And Relief Pressure Test (Greenspro 1260) - Toro GreensPro 1240 Service Manual

Testing the Traction Circuit – Hydraulic Pump Flow and Relief
Pressure Test (GreensPro 1260)
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Test Procedure
GreensPro ™ 1240/1260
14211SL Rev A
The hydraulic pump flow test is recommended to determine the traction circuit
performance. This test compares fluid flow at a 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 hydraulic pump. A worn hydraulic pump or
malfunctioning relief valve is less efficient. Eventually, enough fluid bypass 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:
•
Hydraulic tester with flow meter with pressure gauge with a minimum 45
lpm (12 gpm) capacity.
•
Non-contact tachometer (phototach)
1. Ensure that the motion control pedals are correctly adjusted for the N
position. Also, ensure that the hydraulic pump is at full stroke when the
motion control pedals are moved to the full forward position.
2. Park the machine on a clean, level surface with the transport wheels in the
raised and locked position, shut off the engine, and engage the parking brake.
Before opening the hydraulic system, press the motion control
pedals to release the pressure in the system and avoid injury from
the pressurized hydraulic fluid.
Figure 23
CAUTION
Page 5–25 Hydraulic System: Testing the Hydraulic System
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