16
Pub. No. 1210 - April 2016
RITE-HITE
®
RHH-4000 Dock Leveler Owner’s Manual
HYDRAULIC LEVELER ADJUSTMENTS CONT.
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 16.
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
(BUCHER POWER UNIT)
FLOW CONTROL VALVE ADJUSTMENT
(Controls Leveler Descent)
NOTE:
Check oil level before making any adjustments.
1. Leveler must be adjusted to lower, from full raised
position with lip extended to the header stops in the proper time
frame. See below
Hydra-Rite
TM
Less than 20 seconds
Base
8 to 12 seconds
2.
Press RAISE button and run the platform up until the lip extends.
3.
Release RAISE button and allow the platform to fall completely
below dock and stop. Verify with a stop watch that the platform
falls according to the times in step 1. If not, readjust flow control
valve.
4. Set flow control valve (first loosen locknut on valve). See Figure
17.
- To fall slower - Turn in (clockwise) in 1/4 turn increments.
- To fall faster - Turn out (counter-clockwise) in 1/4 turn
increments.
Or set valve at starting point (3-1/2 turns clockwise from fully
out).
5.
Repeat procedure to verify fall time as needed to fall according
to step 1. 1/8 turns might be necessary to fine tune the
adjustment.
6. Tighten locknut on flow control valve.
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 16 - ARTD LIMIT SWITCH
•
Flow Control valve is factory adjusted.
•
Adjustments to be completed by trained technician only.
