Allied Systems H6H, Service Manual

Page: 70 / 133

Section 2
2 - 5
Figure 2-1 Troubleshooting Analysis Check Chart - 3
PROBLEM POSSIBLE CAUSE CORRECTION
HI-SPEED function will not operate. Insufficient pilot pressure. Repair pilot supply.
No pressure at X1 port Diagnose controller or supply
malfunction, and repair as needed.
Winch case oil level too high. Too much oil added. Drain oil until level at oil level plug.
Winch case oil level too high and
tractor reservoir too low. Oil leak from freespool hose or piston. Visually inspect and repair as needed.
Control lever does not automatically
return to
BRAKE-ON
position.
1. Plunger seal sticking in control
lever.
2. Spring in control lever valve
broken.
Remove and inspect control lever valve.
Replace worn parts or entire assembly
as necessary.
Winch does not respond to lever
movement. 1. Leak in the control lever valve.
2. Control valve seized or blocked. Check for leaks in control lever valve,
and replace if necessary.
Leak in hydraulic system, or loose
hydraulic connections. Visually inspect winch for leaks, and
ensure hydraulic connections are
secure.
Line speed is abnormally slow for
LINE-IN
,
LINE-OUT
or both.
1. Poor pressure signal.
2. Leak in the control lever valve. Visually inspect to check for wear on
control lever valve. Check for leaks in
control lever valve.
Leak in hydraulic system, or loose
hydraulic connections. Visually inspect winch for leaks, and
ensure hydraulic connections are
secure.
Control lever handle turns. Handle parts loose. Tighten all control lever handle parts.
LEDs in switch panel do not illuminate. Polarity backward. Reverse plug connection.
Faulty LED. Replace LED.