Jacobsen HR5111 Service And Repair Instructions page 111

PROBLEM
5. Front mower will not
lower.
6. Mower stops lowering
when handle is released.
7. Mowers will not raise.
8. Mower(s) will stay in
the raised position when
control handle is released.
9. Mower(s) slowly lower by
themselves.
10. Mower(s) do not float.
11. Mowers down pressure
too heavy or too tight.
12. Mower lowers hard (fast),
raises slow.
1. Front mower runs slow.
Push manual override:
Mowers still run slow,
see a, c and d.
Mowers run normal,
see b.
2. Right wing runs slow.
SECTION 8B. FAILURE ANALYSIS
PROBABLE CAUSE
a. Valve detent spool sticks.
b. Restriction in oil return line.
a. Detent spool not locking in
detent position.
a. Engine RPM must be 2000 or
greater.
b. Cylinder leaking internally.
c. Faulty lift valve main relief.
d. Insufficient oil supply, priority
valve.
e. Faulty pump.
a. Cylinder leaking internally.
b. Valve detent poppet not seating
or leaking.
c. Detent spool not retracting
completely, sticking.
a. Cylinder leaking internally.
b. Valve detent poppet not seating
or leaking.
c. Detent spool not retracting
completely, sticking.
a. Valve plunger not holding
detent spool.
b. Valve detent spool sticking, not
going into detent.
c. Valve detent plunger spring
broken.
d. Valve detent plunger worn out.
a. Adjust flotation control.
a. Flotation control set heavy.
IMPLEMENT SYSTEM
a. Engine RPM too low.
b. Faulty motor control valve.
c. Faulty relief valve.
d. Faulty pump section.
a. Reel-to-bedknife too tight.
b. Faulty reel or drive.
c. Faulty reel motor.
8B-3
HYDRAULICS
REMEDY
a. Repair (Section 8H).
b. Test (Section 8R).
a. Repair (Section 8H).
a. Increase engine RPM to 2000.
b. Test (Section 8R).
c. Test (Section 8R).
d. Test (Section 8R).
e. Test (Section 8R).
a. Repair (Section 8L).
b. Repair (Section 8H).
c. Repair (Section 8H).
a. Repair (Section 8L).
b. Repair (Section 8H).
c. Repair (Section 8H).
a. Repair (Section 8H).
b. Repair (Section 8H).
c. Repair (Section 8H).
d. Repair (Section 8H).
a. See Operator's Manual.
a. See Operator's Manual.
a. Increase engine RPM.
b. Test (Section 8R).
c. Test (Section 8R).
d. Test (Section 8R).
a. Adjust (Section 12E).
b. Repair (Section 12D).
c. Test (Section 8R).
8B