Jacobsen HR5111 Service And Repair Instructions page 176

FRONT TRACTION MOTOR TEST
(See Figure 8R-12)
NOTE
A traction pump test must be performed before
proceeding with this test.
17. Connect both front traction motor hoses to the left
and right side tees on pump.
18. Open tester load valve, start engine, advance throt-
tle to 2800 engine rpm.
19. Set parking brake, apply and hold foot brake.
20. Slowly close tester load valve until 3000 psi is
obtained and allow oil to heat up to 150°F.
21. Read/record gpm flow. Subtract from flow obtained
in TRACTION PUMP TEST. Record engine rpm.
•
If flow drops 1/2 gpm or less, traction motor is
okay.
•
If flow drop is 1/2–1 gpm, traction motor is mar-
ginal.
•
If flow drops more than 1 gpm, traction motor
has excessive internal leakage.
SECTION 8R. INSTRUMENT TEST
Figure 8R-12. Front Hydrostatic Motor Test
8R-12
HYDRAULICS