Toro Greensmaster 3120 Service Manual page 103

Cutting Unit Circuit Testing – Gear Pump (P2) Flow Test
(continued)
Greensmaster 3120
17230SL Rev C
The gear pump (P2) flow test is the last in a series of tests recommended to
determine cutting unit circuit performance. This 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. A worn pump will
by−pass hydraulic fluid and make the pump less efficient. Eventually, enough
fluid loss will occur to cause the cutting unit motors to stall under heavy cutting
conditions. Continued operation with a worn, inefficient pump can generate
excessive heat and cause damage to the seals and other components in the
hydraulic system.
Special Equipment Required:
•
Flow Meter with Pressure Gauge that has at least a 45 LPM (12 GPM)
capacity.
•
Phototach (non−contact tachometer).
1. Park machine on a level surface with the cutting units lowered. Make sure
engine is OFF and the parking brake is engaged.
2. Read and adhere to the information provided in
(page 4–35).
g216911
1. Gear pump section (P2)
3. Disconnect hose connection on the bottom of gear pump (P2); refer to
39.
4. Install tester between the gear pump and the disconnected hose. Make
sure the tester is installed in the correct flow direction and the tester flow
control valve is fully open.
Figure 39
2. Hydraulic hose
Page 4–57 Hydraulic System: Testing the Hydraulic System
Testing the Hydraulic System
Figure