Pub. 1147 - Rev. 7 SEPTEMBER 2004
35
Mechanical Dock Leveler Hydraulic Conversion
SEQUENCE VALVE ADJUSTMENT
(CONTROLS LIP EXTENSION)
NOTE
•
When making adjustments in extremely cold
temperatures (below freezing 32°F), run unit several
times (5 to 10 cycles) to confirm that the velocity
fuse does not lock-up with warmer oil.
•
Check oil level before making any
adjustments.
1. When the leveler is fully raised and the lip does not
extend, the Sequence Valve is set too high.
2. Remove protective cap and O-ring. Loosen locknut;
without turning valve body or adjustment screw.
Turn adjustment screw counterclockwise to lower the
valve pressure setting.
See Figure 36.
NOTE
Valve is factory set at 0.70". See Figure 36.
3. Adjustments should be no more than 1/8 turn
increments.
4. Tighten locknut without turning valve body or
adjustment screw.
5. Reinstall O-ring and protective cap and tighten cap.
6. Re-test the unit several times to verify the setting.
7. If the lip begins to extend at any time before the
platform has fully raised, the Sequence Valve setting
is too low.
8. Remove protective cap and O-ring. Loosen locknut;
without turning valve body or adjustment screw. Turn
adjustment screw clockwise to increase the valve
pressure setting.
9. Adjustments should be no more than 1/8 turn
increments.
10. Tighten locknut without turning valve body or
adjustment screw.
11. Reinstall O-ring and protective cap and tighten cap.
12. Re-test the unit several times to verify the setting.
•
Do not operate leveler with anyone
standing on or in front of the lip.
•
Never go under the hydraulic leveler
unless power is locked out and tagged
out according to OSHA regulations and
approved local codes.
•
Sequence value is factory sealed.
Adjustments to be complete by trained
technician only.
DANGER
WARNING
