Jacobsen SLF 1880, Technical/Repair Manual

Page: 156 / 236

8G-54
• If flow drops 0.5 to 1.0 gpm (1.9 to 3.8 lpm), the
4WD valve is marginal.
• If flow drops more than 1 gpm (3.8 lpm), perfor-
mance will be noticeably reduced. The 4WD
valve will require repair or replacement.
36.Open tester load valve, slow engine to idle speed
and shut off engine.
REAR TRACTION MOTOR FLOW
TEST
Right Rear Traction Motor Flow Test
37.Remove blocking disc inserted between right rear
traction motor ports and hoses. Retain the block-
ing disc located in the left rear traction motor
(Figure 8G-9).
38.Install blocking disc at the locations indicated in
(Figure 8G-10) to test the right rear traction motor.
Figure 8G-10. Right Rear Traction Motor Flow Test
39.Open flow meter load valve, set parking brake,
reel switch off, start engine and advance throttle to
high idle position.
40.Slowly close tester load valve until 2200 psi (152
Bar) is obtained.
41.Read/record gpm (lpm) flow on Traction Circuit
Test Record (Figure 8G-13).
NOTICE
Before performing this test, a traction pump flow test,
front traction motor test, and 4WD valve test must be
performed. Flow meter connections are maintained
from traction pump flow test with the exception of the
blocking disc being relocated. The flow lock tool
should remain in place and adjustment retained.
In
Out
Blocking
Disc
Right Rear Traction Motor Flow Test
Top Hydro Port
“Reverse”
Bottom Hydro Port
“Forward”
Top Hydraulic Line
“Reverse”
Bottom Hydraulic Line
“Forward”