RITE-HITE RHH User manual

RHH Hydra-RiteTM / Base
Dock Leveler
Owners Manual
This Manual Covers Dock Levelers Built After Serial Numbers:
05BD480001M and up
PRINTED IN U.S.A.
RITE-HITE PRINT SHOP
PUBLICATION NO. 1210
NOVEMBER 2009
MADE IN U.S.A.
part of the SMOOTH TRANSITION DOK SYSTEMTM
RHH HYDRA-RITETM
Dock Leveler Shown

2Pub. No. 1210 - November 2009
RITE-HITE®RHH Dock Leveler Owner’s Manual
NOTES

Pub. No. 1210 - November 2009 3
NOTICE TO USER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
SAFETY WARNINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
OWNER RESPONSIBILITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
OPERATION INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
MAINTENANCE PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
LEVELER ADJUSTMENTS / TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
HYDRAULIC SCHEMATIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
ELECTRICAL WIRING CHARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
ELECTRICAL SCHEMATICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
REPLACEMENT PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
STANDARD WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .BACK COVER
RITE-HITE®RHH Dock Leveler Owner’s Manual
TABLE OF CONTENTS
PRODUCT SPECIFIC WARRANTY
RITE-HITE®warrants the RHH Hydra-RiteTM / Base Dock Leveler for five-years parts and one-year labor from date of
shipment in accordance with Rite-Hite's Standard Warranty Policy.
NOTICE TO USER
Your local RITE-HITE®representative provides a Planned Maintenance Program (P.M.P.) which can be fitted to your
specific operation. Call your local representative or the RITE-HITE®Corporation at 414-355-2600.
The RITE-HITE®products in this manual are covered by one or more of the following U.S. patents: 5,040,258;
5,271,183; 5,323,503; 5,375,965; 5,440,772; 5,442,825; 5,531,557; 5,546,623; 5,553,987; 5,582,498; 5,664,930;
5,702,223; 5,762,459 (RE: 37,570); 5,882,167; 5,964,572; 6,010,297; 6,052,268; 6,065,172; 6,070,283; 6,074,157;
6,085,375; 6,092,970; 6,106,212; 6,116,839; 6,190,109; 6,220,809; 6,238,163; 6,276,016; 6,311,352; 6,318,947;
6,322,310; 6,360,394; 6,368,043; 6,431,819; 6,488,464; 6,497,076; 6,499,169; 6,505,713; 6,524,053; 6,634,049;
6,654,976; 6,676,360; 6,726,432; 6,773,221; 6,832,403; 6,880,301; 6,892,411; 7,032,267; 7,062,814; 7,134,159;
7,213,285; 7,216,391; 7,363,670; 7,380,305 and pending U.S and foreign patent applications.
RITE-HITE®, LEVEL-RITE®, THINMANTM, SAFE-T-LIP®, HYDRACHEK®, WHEEL-LOKTM, DOK-LOK®, DUAL-DOK®,
SAFE-T-STRUTTM, DOK-COMMANDER®, JUMBOTM, HYDRA-RITETM, SAFE-T-GATE®, and SMOOTH TRANSITION
DOK SYSTEMTM, are trademarks of RITE-HITE®Corporation.

4Pub. No. 1210 - November 2009
RITE-HITE®RHH Dock Leveler Owner’s Manual
SAFETY WARNINGS
LOCKOUT/TAGOUT PROCEDURES
The Occupational Safety and Health Administration (OSHA) requires, in addition to posting safety warnings and barri-
cading the work area (including, but not limited to, trucking office and loading docks), that the power supply has been
locked in the OFF position or disconnected. It is mandatory that an approved lockout device is utilized. An example of
a lockout device is illustrated. The proper lockout procedure requires that the person responsible for the repairs is the
only person who has the ability to remove the lockout device.
In addition to the lockout device, it is also a requirement to tag the power control in a manner that will clearly note that
repairs are under way and state who is responsible for the lockout condition. Tagout devices have to be constructed
and printed so that exposure to weather conditions, or wet and damp locations, will not cause the tag to deteriorate or
become unreadable.
RITE-HITE®does not recommend any particular lockout device, but recommends the utilization of an OSHA approved
device (refer to OSHA regulation 1910.147). RITE-HITE®also recommends the review and implementation of an entire
safety program for the Control of Hazardous Energy (Lockout/Tagout). These regulations are available through OSHA
publication 3120.
When working with electrical or electronic con-
trols, make sure that the power source has been
locked out and tagged out according to OSHA
regulations and approved local electrical codes.
XXXXXXXXXXXX
XXXXXXXXXXX
OPERATE
DO NOT
FIGURE 1 - LOCKOUT/TAGOUT
This is a statement of serious hazard. Failure to
follow the listed instructions could place the
individual at risk of serious injury or death.
This is the highest level statement. Failure to
follow the listed instructions will most likely
result in severe injury or death.
The statements used with this level of warning
deal with a safe operating procedure. If the pro-
cedure is ignored the possibility of personal
injury may exist.
IMPORTANT is used to draw attention to a pro-
cedure that needs to be followed to prevent
machine damage.

Pub. No. 1210 - November 2009 5
RITE-HITE®RHH Dock Leveler Owner’s Manual
OTHER IMPORTANT OPERATIONAL SAFETY WARNINGS
Never be under the dock leveler platform or lip
without:
• Installing the Safe-T-StrutTM or other
supporting device.
• If lip needs to be extended, follow
procedures shown under Safety Devices on
the following page.
• Turning off power to the control box.
• Locking out and tagging out the main
power source, as shown under Safety
Warnings on preceding page.
Always barricade the dock leveler at ground
level and dock level from any form of traffic
when maintenance is required.
Inspect the dock leveler monthly to ensure that
there are no broken or worn parts which could
cause injury to personnel or damage to the
equipment.
• Before starting installation or maintenance,
check and follow the safety procedures of
the facility where the dock leveler is being
installed.
• Never enter a truck/trailer until its brakes are
set, air has been dumped from air ride
suspension (if applicable), and you have
visually inspected to be sure truck/trailer is
securely held in place by a vehicle restraint
or wheel chock per OSHA regulations.
• Never operate the leveler with you, anyone,
or anything on, or in front of the leveler, or
without a truck/trailer parked in position, or
from on the truck/trailer bed.
• DO NOT operate with anyone under platform
or in front of the lip.
• When leveler is not in use, always store it so
that it is supported by the lip supports and
that it is level with the surrounding dock
floor.
• If a malfunction does occur, always call your
authorized RITE-HITE®service representative
immediately.

6Pub. No. 1210 - November 2009
RITE-HITE®RHH Dock Leveler Owner’s Manual
SAFETY DEVICES
Never be under the dock leveler platform or lip
without:
• Installing the Safe-T-Struttm. See below right.
This can be done with the assistance of
another person by:
- Raise leveler until platform reaches its
highest position and lip extends.
Continue to maintain this position.
- Then have assistant insert the smaller end
of the Safe-T-StrutTM through the hole in
the middle of the leveler lip and place the
strut’s wider open end over the base
located on the leveler’s front frame. Align
the holes on the base and the Safe-T-
StrutTM so that the leveler may be secured
with the retaining pin and safety clip.
- Release the pushbutton on powered
levelers allowing the Safe-T-StrutTM to rest
on the underside of the lip.
• Lockout/Tagout power supply.
- Turn off the power to the control box.
- Lockout/tagout the main power source, as
shown under Safety Warnings on the
inside front cover of this manual.
- Always barricade the leveler at dock level
and drive level to prevent any
unauthorized use of the leveler.
Remove the Maintenance Support.
• For Safe-T-StrutTM removal, have an
assistant raise the leveler to its highest
position with lip fully extended. Release the
safety clip and remove retaining pin. Lift strut
off base, and remove from lip. Return the
Safe-T-StrutTM to the proper storage position.
• If you are unable to install the Maintenance
Support properly, contact your authorized
RITE-HITE® Service Representative or RITE-
HITE® Customer Service at 1-414-355-2600.
• Post warnings and barricades at dock level
and at drive level to indicate that work is
being done around and under the leveler
platform.
• Lockout/Tagout power to the leveler and post
warnings when work is being performed on
the leveler.
FIGURE 2 - INSTALL SAFE-T-STRUTTM SUPPORT

Pub. No. 1210 - November 2009 7
RITE-HITE®RHH Dock Leveler Owner’s Manual
OWNER RESPONSIBILITY
1. The owner should recognize the inherent danger of
the interface between dock and transport vehicle.
The owner should, therefore, train and instruct
operators in the safe use of dock equipment in
accordance with the information provided below.
The manufacturer shall publish, provide to the initial
purchaser, and make the following information
readily available to owners:
•Installation instructions
•Recommended initial and periodic inspections
procedures
•Maintenance procedures
•Operating instructions
•Descriptions or specifications for replaceable or
repairable parts
•Tables identifying the grade (slope) for all
variations of length or configuration of the dock
equipment
•Information identifying the maximum
uncontrolled drop encountered upon sudden
removal of support while within the working
range of the equipment.
It shall be the responsibility of the owner to verify
that the material listed in this section has been
received and that it is made available for the
instruction and training of personnel entrusted with
the use or maintenance of the dock equipment.
2. When a transport vehicle is parked at a loading
dock, it is important that the vehicle is relatively
perpendicular to the dock face and in close contact
with at least one of the dock bumpers.
3. Nameplates, cautions, instructions, and posted
warnings shall not be obscured from the view of
operating or maintenance personnel for whom such
warnings are intended.
4. Manufacturer’s recommended periodic maintenance
and inspection procedures in effect at date of
shipment shall be followed, and written records of
the performance of these procedures should be kept.
5. As with any piece of machinery, dock equipment
requires routine maintenance, lubrication, and
adjustments. Your local RITE-HITE®representative
offers owners the option of a Planned Maintenance
Program (P.M.P.). As part of this service, your local
RITE-HITE®representative will do all routine
maintenance, lubrication, and adjustments.
6. Dock equipment that is structurally damaged shall
be removed from service, inspected by a
manufacturer’s authorized representative, and
repaired as needed before being placed back in
service.
7. The manufacturer shall make available
replacement nameplates, caution/instruction labels,
and operating/maintenance manuals upon request
of the owner. The owner shall see that all
nameplates, caution/instruction markings or labels
are in place and legible, and that the appropriate
operating/maintenance manuals are provided to
users.
8. Modifications or alterations of dock equipment shall
be made only with written permission of the original
manufacturer. These changes shall also satisfy all
safety recommendations of the original equipment
manufacturer for the particular application of the
dock equipment.
9. When industrial trucks are driven on and off
transport vehicles during the loading and
unloading operation, the brakes on the transport
vehicle shall be applied and wheel chocks or a
positive restraining device shall be engaged.
10. In selecting dock equipment, it is important to
consider not only present requirements but also
future plans or adverse environments.

NORMAL OPERATION
1. Activate the leveler by pushing and holding the
RAISE button until leveler is fully raised and lip is
fully extended. See figure 3.
NOTE: Some levelers may be equipped with a two
button control box. If so, push and hold the RAISE
button to raise the platform. While pressing the
RAISE button, push the LIP EXTEND button to fully
extend the lip when the lip has cleared trailer bed.
2. When lip is fully extended, release RAISE button. The
leveler will automatically lower onto the truck/trailer
bed. See figure 4.
NOTES:
a. Some levelers may be equipped with a two button
control box. If so, release RAISE and LIP EXTEND
buttons.
b. Be sure the lip is in full contact with the truck/trailer
bed before loading or unloading truck/trailer.
3. See Storing Leveler.
NOTES:
a. Levelers without Automatic Return to Dock
(ARTD) If the truck/trailer departs, the leveler will
move to its lowest position and the lip will fall to the
pendant position inside the dock bumpers. See
Storing Leveler.
b. Levelers with Automatic Return to Dock (ARTD) If
the lip is on the truck/trailer and the truck departs, the
leveler will move to its lowest position and the lip will
begin to lower. As the lip drops toward the pendant
position, the ARTD system automatically returns the
leveler to the stored position without operator
assistance.
BELOW DOCK LOADING OPERATION
1. Activate the leveler by pushing and holding the
RAISE button until leveler is fully raised and lip is
fully extended. See figure 3.
NOTE: Some levelers may be equipped with a two
button control box. If so, push and hold the RAISE
button to raise the platform. While pressing the
RAISE button, push the LIP EXTEND button to fully
extend the lip when the lip has cleared trailer bed.
2. When lip is fully extended, release RAISE button. If
equipped with safety legs, pull and hold the Safety
Leg Chain as the leveler lowers automatically onto
the truck/trailer bed. See figure 5.
NOTE: Some levelers may be equipped with a two
button control box. If so, release RAISE and LIP
EXTEND buttons.
3. When loading/unloading is complete, continue with
normal operation or return the leveler to stored
position. See Storing Leveler.
8Pub. No. 1210 - November 2009
RITE-HITE®RHH Dock Leveler Owner’s Manual
OPERATION INSTRUCTIONS POWERED LEVELERS
FIGURE 3 - POWERED DOCK LEVELER
FIGURE 4 - NORMAL OPERATION
FIGURE 5 - BELOW DOCK OPERATION
(SAFETY LEG EQUIPPED SHOWN)
Safety Leg
Chain

DOCK LEVEL (OR LOWER) END LOADING
OPERATION
1. Activate the leveler by pushing and holding the
RAISE button until leveler is fully raised and lip
begins to extend. See figure 6.
NOTE: Some levelers may be equipped with a two
button control box. If so, push and hold the RAISE
button until the lip clears the lip supports. While
pressing the RAISE button, push the LIP EXTEND
button briefly to extend the lip beyond the lip
supports.
2. When lip extends about 2 inches, release RAISE
button. See figure 6. The leveler will lower to the
below dock position with the lip positioned between
the face of the loading dock and the truck/trailer bed.
See figure 7.
NOTES:
a. Some levelers may be equipped with a two button
control box. If so, release RAISE and LIP EXTEND
buttons
b. If equipped, pull and hold the Safety Leg Chain as
the leveler lowers for below dock end loads. See
figure 8. DO NOT pull chain for dock level end loads.
c. End load at dock level and above can be handled
with the leveler in its stored position on units without
a Safe-T-Lip®.
d. If the lip extended too far, quickly push and release
the RAISE button to slightly retract the lip.
e. If the lip was not extended far enough and hits the lip
supports, repeat this step allowing the lip to extend
farther.
3. When loading/unloading is complete, continue with
normal operation or return the leveler to stored
position. See Storing Leveler.
Pub. No. 1210 - November 2009 9
RITE-HITE®RHH Dock Leveler Owner’s Manual
OPERATION INSTRUCTIONS POWERED LEVELERS CONT.
FIGURE 8 - END LOAD OPERATION
(EQUIPPED WITH SAFETY LEGS)
FIGURE 7 - END LOAD OPERATION
FIGURE 6 - END LOAD OPERATION - LIP POSITION
Safety Leg
Chain

STORING LEVELER
1. To store the leveler, push and hold the RAISE button
until leveler is about 6 inches above dock level and
lip is fully pendant.
2. Release RAISE button. Leveler will lower to dock
level with lip resting in the lip supports. See figure 9.
NOTE: On Powered levelers with Automatic Return to
Dock (ARTD). If the lip is on the truck/trailer and the
truck departs, the leveler will move to its lowest
position and the lip will begin to lower. As the lip
drops toward the pendant position, the ARTD system
automatically returns the leveler to the stored position
without operator assistance.
10 Pub. No. 1210 - November 2009
RITE-HITE®RHH Dock Leveler Owner’s Manual
OPERATION INSTRUCTIONS POWERED LEVELERS CONT.
FIGURE 9 - LEVELER STORED

SUGGESTED LEVELER MAINTENANCE
NOTE: Follow maintenance procedures below as
outlined. Include the specific steps for your leveler
model.
NOTE: Your local RITE-HITE®representative
provides a Planned Maintenance Program (P.M.P.)
which can be fitted to your specific operation. Call
your local representative.
Daily
1. Remove debris on and around leveler. Be sure the
hinge section of the lip and the platform is clean.
2. Check unit for proper operation.
90 Days
1. Perform all Daily Maintenance.
2. Clean pit.
3. Inspect lip out mechanism (pins, lip crank, links,
chains and shackles). Replace if worn.
4. Lubricate the leveler with the proper lubricants.
See figure 11 or 12.
5. Inspect all weather seals (if installed) and replace if
worn or damaged.
6. Inspect dock bumpers. Four inches (4") of bumper
protection is required. Worn, torn, loose or missing
bumpers must be replaced.
7. Check conditions of concrete, angles and welds.
Repair or replace if necessary.
8. Inspect structure, hinge pins, clevis pins and cotter
pins for abnormal wear.
9. Inspect all conduit boxes, control boxes and electrical
connections for damage. Repair or replace if worn or
damaged.
NOTE: If control box has evidence of condensation.
a. Inspect conduit. Conduit should be routed to enter
through the bottom or side of the enclosure. A drip
leg may be needed if the conduit is filling with water.
b.Inspect the seal on the cover of the enclosure.
The seal should be securely adhered to the cover
with no signs of peeling or bubbling. Repair or
replace if worn or damaged.
c. For non-metalic enclosures, breather vent part
number 122130 may be installed. The vent is NEMA
4X and will not change the enviromental rating of the
control box.
10. With the leveler supported by the maintenance strut,
check hydraulic fluid level in tank. Add fluid if
necessary. Use only Rite-Hite approved hydraulic
fluids.
360 Days
1. Perform Daily and 90-Day Maintenance.
2. Check and tighten control box mounting hardware.
3. Retorque all shoulder bolts on units equipped with
Safe-T-Lip®. See figure 10.
Pub. No. 1210 - November 2009 11
Read and obey these instructions to prevent
personal injury.
• Post safety warnings and barricade work
area, at dock level and at ground level, to
prevent unauthorized use of the dock
position before maintenance has been
completed.
• Make sure to install the maintenance
support strut before proceeding with any
repair work.
RITE-HITE®RHH Dock Leveler Owner’s Manual
MAINTENANCE PROCEDURES
DIM
A
Safe-T-Lip®Shoulder Bolt
Torque Specifications
Spool Module with a 1” thick bar (See DIM A)
• Torque Range: 185 - 200 Ft-Lbs.
Spool Module with a 1-1/2” thick bar (See DIM A)
• Torque Range: 400 - 450 Ft-Lbs.
FIGURE 10 - SHOULDER BOLT TORQUE

12 Pub. No. 1210 - November 2009
RITE-HITE®RHH Dock Leveler Owner’s Manual
RHH HYDRA-RITE LUBICATION CHART
FIGURE 11 - HYDRAULIC POWERED LEVELER LUBRICATION (HYDRA-RITETM)
OIL SAE 30 Weight
Dry Spray Lubricant
NOTE:
Inside and Under
Slots On Safe-T-Lip®
Grease - Moly Based
NOTE:
Only if grease zerks are present.
NOTE:
Check Hydraulic Fluid level.

Pub. No. 1210 - November 2009 13
RHH BASE LUBRICATION CHART
RITE-HITE®RHH Dock Leveler Owner’s Manual
FIGURE 12 - HYDRAULIC LEVELER LUBRICATION (BASE)
OIL SAE 30 Weight
Dry Spray Lubricant
NOTE:
Inside and Under
Slots On Safe-T-Lip®
Grease - Moly Based
NOTE:
Only if grease zerks are present.
NOTE:
Check Hydraulic Fluid level.
•DO NOT operate leveler with anyone standing on or
in front of the lip.
•NEVER go under the hydraulic leveler platform or lip
without installing the Maintenance Support.
•Make sure that the leveler power is locked out and
tagged out according to OSHA regulations and
approved local codes.
LIP STOP BOLT:
The lip stop bolt adjusts the position of the lip when
the leveler is stored to allow the lip to be centered on
lip supports when stored.
FIGURE 13 - LIP STOP BOLT
Lip
Stop Bolt
Lip
Centered
In Keepers
Standard Lip Safe-T-Lip®

14 Pub. No. 1210 - November 2009
RITE-HITE®RHH Dock Leveler Owner’s Manual
HYDRAULIC LEVELER ADJUSTMENTS CONT.
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
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-RiteTM 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

Pub. No. 1210 - November 2009 15
RITE-HITE®RHH Dock Leveler Owner’s Manual
HYDRAULIC LEVELER ADJUSTMENTS CONT.
SEQUENCE VALVE ADJUSTMENT
(Controls Lip Extension)
NOTE: 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 15.
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.
NOTE: Sequence valve is factory sealed.
Adjustments to be completed by trained technician
only.
FIGURE 15 - POWER UNIT END HEAD (RHH BASE SHOWN)
Ramp Cylinder Port
Lip Cylinder
Port
Adjustable
Sequence
Valve
Pilot
Operated
Check Valve
Pilot To Close
Check Valve
System
Relief
Valve
Adjustable
Shuttle
Valve
Optional Infinite Lip
Control (IFC),
Emergency Stop
(ESB)
Port

16 Pub. No. 1210 - November 2009
RITE-HITE®RHH Dock Leveler Owner’s Manual
HYDRAULIC POWERED LEVELER TROUBLESHOOTING
Problem Probable Cause Solution
1. Platform does not raise a. Power has been disconnected. a. Verify that power has not been
disconnected.
Verify that disconnect circuit breaker
or fuses are not tripped.
b. The motor has been miswired. b. Verify that the motor has been wired
according to the motor wiring
diagram.
c. Overload tripped. c. Push RESET on overload relay.
d. Debris is lodged on or around d. Check for and remove any lodged
the leveler. materials on or around the leveler.
e. Hydraulic fluid level is low. e. Check oil level when the unit is held
open with the maint. support.
Refill if necessary.
2. Leveler runs continuously. a. The pushbutton, contact block a. Repair or replace components.
or motor contactor damaged.
3. Lip extends slowly and/or does not a. Debris on lip hinge. a. Remove debris from the lip hinge.
extend. b. Lip impacted or bent. b. Lubricate per maintenance
procedures or replace lip.
c. Hydraulic fluid level low. c. Check oil level when unit is held
open with the maint. support.
Refill if necessary.
4. Platform does not lower. a. Velocity fuse has locked up. a. Attempt to raise the unit to unlock the
velocity fuse.
b. Debris is lodged on or around b. Check and removed any lodged
the leveler. debris on or around leveler.
5. Platform raises very slowly. a. Weight on top of platform. a. Remove weight from platform.
b. Hydraulic fluid level is low. b. Check oil level when the unit is held
open with the maint. support.
Refill if necessary.
c. Low voltage c. Verify ± 10% nominal voltage while
unit is running.
d. Power unit/pump/motor failure. d. Replace power unit assembly.
6. Lip does not store properly. a. The lip stop bolt is not adjusted a. Verify that the lip stop bolt is properly
properly. adjusted.
b. Debris. b. Remove debris.
c. Lip supports. c. Repair or replace the lip supports.
7. Fuse or circuit breaker trips. a. Undersized fuse or circuit a. Verify 20 amp for 120VAC and 15
breaker. amp for 240VAC.
b. Low voltage. b. Verify ± 10% nominal voltage while
unit is running.
c. Short circuit in wiring. c. Check wiring connections and verify.
d. Wire gage is to small. Distance d. Verify minimum wire gage per
is too long. distance is correct. See chart on
page 18.

Pub. No. 1210 - November 2009 17
RITE-HITE®RHH Dock Leveler Owner’s Manual
HYDRAULIC LEVELER - HYDRAULIC SCHEMATIC
FIGURE 17 - HYDRAULIC SCHEMATIC - BASE
Power Unit Assembly Velocity Fuse
Ramp Cylinder
Lip Cylinder
140-170
Micron
Strainer
Motor
3450 RPM
M
Anti-Cavitation
Check Valve
8:1 P.O.
Check Valve
Orifice
Plug
.047”
(Base Only)
Adjustable
System
Relief Valve
1200 PSI
Adj. Shuttle
Valve. 100 PSI
at 1.4 GPM
Backpressure Adjustable
Sequence Valve
1000 PSI
Optional
2W N.O. Valve
For IFC
8:1 P.T.C.
Check Valve
“RAMP”
Port
“LIP”
Port
TANK
Port
6 GPM (6’)
2.5 GPM (8’)
5 GPM (10’ & 12”)
2.5” X 13.62” S.A. (6’)
2.5” x 16.62” S.A. (8’)
2.75” x 20.62” S.A. (10’ & 12’)
1.5” x 6” S.A.
Pump
1.1 GPM
@ 750 PSI
Power Unit Assembly
Velocity Fuse
Ramp Cylinder
Lip Cylinder
140-170
Micron
Strainer
Motor
3450 RPM
M
Anti-Cavitation
Check Valve
8:1 P.O.
Check Valve
Adjustable
System
Relief Valve
1250 PSI
Adj. Shuttle
Valve. 130 PSI
at 5 GPM
Backpressure Adjustable
Sequence Valve
1000 PSI
Optional
2W N.O. Valve
For IFC
8:1 P.C.
Check Valve
“RAMP”
Port
“LIP”
Port
TANK
Port
8 GPM
4” X 14” S.A. (6’)
4” x 18” S.A. (8’ & 10’)
4” x 20” S.A. (12’)
2.5” x 6” S.A.
Pump
3.6 GPM
@ 250 PSI
FIGURE 16 - HYDRAULIC SCHEMATIC - HYDRA-RITETM

18 Pub. No. 1210 - November 2009
RITE-HITE®RHH Dock Leveler Owner’s Manual
ELECTRICAL WIRING CHARTS
Average Motor Loads (Amps)
Air Hydraulic Leveler
Levelers Base Hydra-Rite
3/4 hp 1hp 1hp
110-120/1/60 12.0 10.0 N/A 21.2
208-230/1/60 7.0 5.0 N/A 10.6
208-230/3/60 N/A N/A 3.8 5.4 - 4.3
380-415/3/50 N/A N/A 2.5 2.3
440-480/3/60 N/A N/A 1.9 2.5
575-600/3/60 N/A N/A 1.4 1.4
Minimum Wire Size Chart for Various Line Lengths and Line Loads
Line Length (In Feet)
0-50 51-100 101-150 151-200 201-250 251-300 301-350 351-400
110-120/1 1300 watts Air Powered Levelers 128664 432
110-120/1 3/4 hp Hydraulic Levelers 12 10 8 6 4 4 4 3
110-120/1 1 hp Hydraulic Levelers 108644 321
110-120/1 1 hp Hydraulic Hydra-Rite 86432 11/01/0
208-240/1 1533 watts Air Powered Levelers 14 14 12 10 10 8 8 8
208-240/1 3/4 hp Hydraulic Levelers 14 14 14 12 10 10 10 8
208-240/1 1 hp Hydraulic Levelers 14 12 12 10 8 8 8 6
208-240/1 1 hp Hydraulic Hydra-Rite 14 12 10 8 8 6 6 6
208-240/3 1hp Hydraulic Levelers 14 14 12 12 10 10 10 8
380-415/3 1 hp Hydraulic Levelers 14 14 14 14 14 14 14 14
440-480/3 1 hp Hydraulic Levelers 14 14 14 14 14 14 14 14
575-600/3 1 hp Hydraulic Levelers 14 14 14 14 14 14 14 14

Pub. No. 1210 - November 2009 19
RITE-HITE®RHH Dock Leveler Owner’s Manual
ELECTRICAL SCHEMATIC
DENOTES MALE/FEMALE PLUG CONNECTION
DENOTES WIRE CONNECTIONS THRU TERMINAL BLOCK.
DENOTES WIRE NUT CONNECTION
DENOTES FIELD WIRES.
PB1
FOR VEHICLE RESTRAINT ITC.
TO DOK-LOK CONTROL BOX
"RAISE"
208-240v. 1PH. 60HZ. USE 10.0A DUAL ELEMENT TIME DELAY
208-240v. 1PH. 50HZ. USE 10.0A DUAL ELEMENT TIME DELAY
FROM CUSTOMER MAIN POWER & SAFETY PROTECTION
110-120v. 1PH. 60HZ. USE 15.0A DUAL ELEMENT TIME DELAY
T1
SEE NOTE 1
T2
IF FUSED DISCONNECT IS
NOT PROVIDED BY RITE-HITE
PRODUCTS CORPORATION,
FUSED DISCONNECT MUST
BE PROVIDED BY OTHERS
AND INSTALLED PER LATEST
EDITION OF UL508A AND NEC
REQUIREMENTS.
SEE NOTE 1
FUSED DISCONNECT
SEE NOTE 4
(BY OTHERS) A BRANCH CIRCUIT DISCONNECT SHALL
BE LOCATED WITHIN A 50 FT. RADIUS
AND BE VISIBLE FROM THE CONTROL
BOX LOCATION. [REFERENCE LATEST
EDITION OF NEC, SECTION 430]
MOTOR - 3/4 H.P.
(SEE MOTOR FLA CHART)
2850 R.P.M.
120v. 1 PH. 60 Hz
(Thermally Protected With Auto Reset)
J-BOX J-BOX
MOTOR
PIT
LEGEND:
MOTOR CONNECTIONS
110-120v. 1Ph.
IF ROTATION IS WRONG
REVERSE T5 AND T8 LINES.
M
MOTOR
J-BOX
MOTOR - 3/4 H.P
(SEE MOTOR FLA CHART)
3450 R.P.M.
208-240v. 1 PH. 50/60 Hz
(Thermally Protected With Auto Reset)
Additional Motor Voltage Connections
M
NOTE:
1. All Incoming Power (From Disconnect to Control Box) and Leveler Motor
Field Wiring To Be Minimum #12GA./Maximum #10GA. 60/75 Deg. C
Copper Wire, Insulated Sufficiently For Incoming Voltage.
2. All Control Field Wiring To Be Minimum #14GA. 60/75 Deg. C Copper Wire
Only, Insulated Sufficiently For Incoming Power.
3. All Internal Control Box Wiring To Be Minimum #16GA. 90 Deg. C, Red Copper
Wire Unless Otherwise Noted, Insulated Sufficiently For Incoming Power.
4. Incoming Power Field Wiring: See Minimum Wire Size Chart.
G
G
LN
N
1L1
1
T1 T2
P1 P2 T4
T3 T8
T2
T5
T1 T2
P1 P2 T4
T3
T8
T2 T5
T1
T2
MOTOR CONNECTIONS
208-240v. 1Ph.
IF ROTATION IS WRONG
REVERSE T5 AND T8 LINES.
T1
T2 G
FIGURE 18 - RHH (BASE) TYPE 1 CONTROL BOX - 120V./208-240V. 50/60HZ. SINGLE PHASE

20 Pub. No. 1210 - November 2009
RITE-HITE®RHH Dock Leveler Owner’s Manual
ELECTRICAL SCHEMATIC CONT.
"DOOR INTERLOCK"
LS1
M
1L1
H3(RD)
PB1
H5(RD)
H5
H5A H5A(RD) N(WH)
N
N(WH)
1L1(RD)
N
H3(RD)
PB2
H7
"LIP OUT"
N
1L2
H3(RD)
TO DOK-LOK CONTROL BOX
FOR VEHICLE RESTRAINT ITC.
"RAISE"
SEE NOTE 1
SEE NOTE 1
10FU1
G
IF FUSED DISCONNECT IS NOT
PROVIDED BY RITE-HITE PRODUCTS
CORPORATION, FUSED DISCONNECT
MUST BE PROVIDED BY OTHERS AND
INSTALLED PER LATEST EDITION OF
UL508A AND NEC REQUIREMENTS.
(BY OTHERS)
FUSED DISCONNECT
A BRANCH CIRCUIT DISCONNECT SHALL BE LOCATED
WITHIN A 50 FT. RADIUS AND BE VISIBLE FROM THE
CONTROL BOX LOCATION. [REFERENCE LATEST
EDITION OF NEC, SECTION 430]
1.0 AMP. 250v.
DUAL ELM
TIME DELAY
G
SEE NOTE 4
#12GA. MINIMUM,
90°C, BLACK
#12GA. MINIMUM,
90°C, WHITE
JUMPER WIRE
(4) (3)
SHOWN WITH DOOR CLOSED
N.O.
G
R1-1
(1) (4)
(5)(6)
120 VAC
MTR RLY
R1
SEE NOTE 3
208-240v. 1PH. 60HZ. USE 10.0A DUAL ELEMENT TIME DELAY FUSES
FROM CUSTOMER MAIN POWER & SAFETY PROTECTION DEVICE
110-120v. 1PH. 60HZ. USE 15.0A DUAL ELEMENT TIME DELAY FUSES
LIP OUT
120 VAC, 0.3 AMPS
7 (BLK) X2 (WHT)
SOLENOID 1
FOR 208-240/1/60, INCOMING POWER AND
MOTOR WIRING TERMINATE AT "1L2"
J-BOX
PIT
J-BOX
MOTOR
DENOTES MALE/FEMALE PLUG CONNECTION
DENOTES WIRE CONNECTIONS THRU TERMINAL BLOCK.
DENOTES WIRE NUT CONNECTION
DENOTES FIELD WIRES.
LEGEND:
MOTOR - 3/4 H.P.
(SEE MOTOR FLA CHART)
2850 R.P.M.
120v. 1 PH. 60 Hz
(Thermally Protected With Auto Reset)
M
MOTOR
J-BOX
MOTOR - 3/4 H.P
(SEE MOTOR FLA CHART)
3450 R.P.M.
208-240v. 1 PH. 50/60 Hz
(Thermally Protected With Auto Reset)
Additional Motor Voltage Connections
NOTE:
1. All Incoming Power (From Disconnect to Control Box) and Leveler Motor
Field Wiring To Be Minimum #12GA./Maximum #10GA. 60/75 Deg. C
Copper Wire, Insulated Sufficiently For Incoming Voltage.
2. All Control Field Wiring To Be Minimum #14GA. 60/75 Deg. C Copper Wire
Only, Insulated Sufficiently For Incoming Power.
3. All Internal Control Box Wiring To Be Minimum #16GA. 90 Deg. C, Red Copper
Wire Unless Otherwise Noted, Insulated Sufficiently For Incoming Power.
4. Incoming Power Field Wiring: See Minimum Wire Size Chart.
T1 T2
P1 P2 T4
T3 T8
T2T5
T1 T2
P1 P2 T4
T3
T8
T2 T5
N
N1L1
L1
MOTOR CONNECTIONS
110-120v. 1Ph.
IF ROTATION IS WRONG
REVERSE T5 AND T8 LINES.
MOTOR CONNECTIONS
208-240v. 1Ph.
IF ROTATION IS WRONG
REVERSE T5 AND T8 LINES.
G
T1
T2 G
T1
T2
FIGURE 19 - RHH (BASE) TYPE 2 CONTROL BOX - 120V./208-240V. 60HZ. SINGLE PHASE