Testing The Steering And Lift Circuit - Gear Pump (P2) Flow And Circuit Relief Valve - Toro Groundmaster Series Service Manual

Testing the Steering and Lift Circuit – Gear Pump (P2) Flow and
Circuit Relief Valve
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Hydraulic System: Testing the Hydraulic System
Gear Pump (P2) Flow and Circuit Relief Valve
Gear pump (P2) is designed to satisfy both steering cylinder and lift cylinder
needs simultaneously (at full speed throttle). The Gear Pump (P2) Flow Test
compares fluid flow at No Load with fluid flow Under Load. A drop in flow under
load of more than 15% indicates the gears and wear plates in the pump have
worn. Continued operation with a worn pump can generate excessive heat and
cause damage to the seals and other components in the hydraulic system.
The relief valve for the steering and lift circuit is integrated into the steering
control valve. If both steering and lift operations perform poorly, perform the gear
pump (P2) flow test and the circuit relief valve test.
If machine steering is sluggish or otherwise performs poorly, refer to
Steering and Lift Circuit – Steering Cylinder and Circuit Relief Valve (page
Figure 37
Page 5–40
Testing the
Groundsmaster ® 3200, 3300 and 3310
19240SL Rev A
5–45).