Jacobsen HR5111 Service And Repair Instructions page 158

HYDRAULICS
SECTION 8Q. HYDRAULIC FIELD TEST PROCEDURES
•
If the engine does not labor, a fault exists in the
traction pump.
4. Reconnect hydraulic lines to the traction pump.
5. Remove both hydraulic lines from the 4 wheel valve.
Plug the hoses and cap the valve ports.
6. With the tractor on asphalt or concrete, chain the
tractor to an unmovable object such as a pole or
tree.
7. With the engine throttle wide open, 2 wheel drive
and cutting units lowered, slowly step on the trac-
tion pedal.
•
•
8. Reconnect hydraulic lines to 4 wheel drive valve. A
probable cause may be in the 4 wheel drive sys-
tem. Perform an instrument test, Section 8R.
Figure 8Q-2. Traction System
8Q-2
If the engine labors or the tractor drive tires
brake traction the traction motor is okay, pro-
ceed with Step 8.
If the engine does not labor, the fault may be
the traction motor.