14
Pub. No. 1210 - April 2016
RITE-HITE
®
RHH-4000 Dock Leveler Owner’s Manual
HYDRAULIC LEVELER ADJUSTMENTS
HYDRAULIC POWERED LEVELER ADJUSTMENTS
ARTD ADJUSTMENTS:
ARTD Limit Switch Cam
NOTE:
Before continuing be sure the lip stop bolt is properly
adjusted. See page 13.
1. Raise leveler and install a strut securely behind the header or
mini-header to allow the lip to hang pendant and rest against the
lip stop bolt.
2.
Adjust ARTD Cam.
a. Adjust collars so the front edge of ARTD cam is 1/16” behind the
centerline of the ARTD limit switch. See figure 14.
b. Tighten front collar while holding the 1/16” adjustment.
c. Push the rear collar forward as much as possible and tighten.
ARTD cam assembly should rotate freely.
3.
Run the leveler to test the adjustment. Verify that the lip falls a
minimum of 4” before ARTD is initiated. If not, move the cam
forward slightly.
NOTE:
It is not recommended to position the ARTD cam in front
of the ARTD limit switch centerline.
HYDRAULIC VALVE ADJUSTMENTS
(HALDEX POWER UNIT)
SHUTTLE VALVE ADJUSTMENT
(Controls Leveler Descent)
NOTE:
Check oil level before making any adjustments.
NOTE:
Valve Position Illustrated Represents The Nominal
Factory Setting Of 3-1/2 Turns Out From The Fully Turned In
Position
1. Leveler must be adjusted to lower, from full raised
position with lip extended to the header stops the proper time
frame. See below
Hydra-Rite
TM
Less than 20 seconds
Base
8 to 12 seconds
2. Remove protective cap and O-ring. Loosen locknut; without
turning valve body or adjustment screw. Turn adjustment screw
to vary platform lowering speed. Adjustments should be no more
than 1/8 turn increments.
3. Tighten adjustment screw to decrease platform speed while
lowering (excessive loosening can eliminate platform lowering).
4. Loosen adjustment screw to increase platform speed while
lowering (velocity fuse may lock-up as a result of increased
platform speeds while lowering).
5. Tighten locknut without turning valve body or adjustment screw.
6. Reinstall o-ring and protective cap and tighten cap.
7. Re-test the unit several times to verify the setting.
•
Shuttle valve is factory adjusted and sealed.
•
Adjustments to be completed by trained technician only.
7/8”
Ref.
C
1/16”
ARTD
Limit Switch
Rear
Collar
ARTD Cam
Front Washer
Front Collar
NOTE:
There Should Be A Small Amount Of Free Movement
Between The ARTD Cam And The Rear Collar When
The Rear Collar Is Pushed Against The ARTD Cam.
This Edge Of Cam
To Be Positioned
1/16” Behind The
Center Of Roller
As Shown.
ARTD Cam Adjustment Detail
(Shown With Lip Pendant And Lip Stop Bolt Adjusted)
L
FIGURE 14 - ARTD LIMIT SWITCH
