Textron Jacobsen Super LF 1880 Fairway Mower with ROPS, Service & Repair Instructions

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HYDRAULICS
8O-61
Lift/Lower Valve Test
Section three of the reel (auxiliary) hydraulic pump
supplies hydraulic flow to the lift valve.
1. Shut down engine and remove ignition key.
2. Connect the flow meter to the reel (auxiliary)
hydraulic pump section three. Connect the flow
meter IN port to the section three-pressure fitting
and the flow meter OUT port to the section three
pressure hose (Figure 8O-11).
3. Set parking brake, start engine, and advance
engine speed to full throttle.
4. Record pump section three no load flow indication
(g).
5. Slowly close tester load valve until 1000 psi (6894
kPa) is indicated on the pressure gauge. Record
flow indication (h).
6. Subtract flow indication (h) from flow
indication (g). The result is section three pump
leakage.
Conclusion
• If leakage is less that ½ gpm (1.9 lpm), pump is not
at fault.
• If leakage is ½ to 1 gpm (1.9 to 3.8 lpm), pump and/
or reel valve circuit relief is marginal.
• If leakage is 1 gpm (3.8 lpm) pump and/or reel valve
circuit relief may be faulty.
7. Shut down the engine and remove the ignition
key.
8. Remove test equipment and connect hose to
pump.
Figure 8O-11. Lift Pump Test
Load
Valve
In
Out
Pump Section
Three Outlet
Hose
Pump Section
Three Outlet
Fitting