Jacobsen HR5111 Service And Repair Instructions page 171

CHARGE PUMP TEST (See Figure 8R-7)
1. Remove outlet line from pump section 4 (pump
section closest to the front axle).
2. Connect the IN port of the tester to the pump out-
let port.
3. Connect hose from the OUT port of tester to the
pump outlet line.
4. Open tester load valve, start engine, advance throt-
tle to 2800 engine rpm.
5. Read/record no load flow. It should be 7.5 gpm.
6. Slowly close tester load valve until 1500 psi is
obtained and allow oil to heat up to 150°F.
CAUTION
Do not exceed 1500 psi.
7. Read/record gpm flow and engine rpm.
•
If flow drops 1/2 gpm or less, pump is okay.
•
If flow drop is 1/2–1 gpm, pump is marginal.
•
If flow drops more than 1 gpm, pump has ex-
cessive internal leakage.
8. Reconnect outlet line to pump section 4.
SECTION 8R. INSTRUMENT TEST
Figure 8R-7. Charge Pump Test
8R-7
HYDRAULICS
8R