RITE-HITE Wheel-Lok GWL-2300 User manual

GWL-2300 Wheel-LokTM
Vehicle Restraint
Owners Manual
This Manual Covers Restraints Built After Serial Numbers:
GW231001 and up
PRINTED IN U.S.A.
RITE-HITE PRINT SHOP
PUBLICATION NO. 1177
NOVEMBER 2010
MADE IN U.S.A.

2Pub. No. 1177 - November 2010
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . 2
SAFETY WARNINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
OWNER RESPONSIBILITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
DEFINITION AND FUNCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
OPERATING PROCEDURES & TESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
MAINTENANCE (BASED ON TYPICAL APPLICATIONS OF 8 TRUCKS PER DAY). . . . . . . . . . . . . . . . . . . . . . . . 13
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
HORN OVERRIDE CODE AND DIAGNOSTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
ELECTRICAL SCHEMATIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
REPLACEMENT PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BACK COVER
RITE-HITE®GWL-2300 Owner’s Manual
TABLE OF CONTENTS
INTRODUCTION
Read and understand this manual before attempting to install or operate. For best results, have this product serviced
by your authorized RITE-HITE®representative.
The GWL-2300 vehicle restraint by RITE-HITE is intended to provide a safer workplace for workers in shipping and
receiving dock areas. The GWL-2300 vehicle restraint is a restraint device that, when properly installed and operated,
retains a secure connection between the truck and dock. Signal lights, warning horn and signs provide instructions to
the truck driver and GWL-2300 vehicle restraint operator that a safe condition exists. The GWL-2300 vehicle restraint
is operated by pressing push buttons on an inside control box.
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: 5,271,183;
5,323,503; 5,546,623; 5,553,987; 5,582,498; 5,664,930; 5,702,223; 5,762,459 (RE: 37,570); 5,882,167; 6,065,172;
6,070,283; 6,085,375; 6,092,970; 6,106,212; 6,116,839; 6,190,109; 6,220,809; 6,276,016; 6,311,352; 6,318,947;
6,322,310; 6,360,394; 6,368,043; 6,431,819; 6,488,464; 6,499,169; 6,502,268; 6,505,713; 6,524,053; 6,634,049;
6,654,976; 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; 7,503,089; 7,553,431; 7,578,097; 7,681,271 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.

Pub. No. 1177 - November 2010 3
RITE-HITE®GWL-2300 Owner’s Manual
SAFETY WARNINGS
LOCKOUT/TAGOUT PROCEDURES
The Occupational Safety and Health Administration requires that, in addition to posting safety warnings and
barricading the work area, 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®Corporation does not recommend any particular lockout device, but recommends the utilization of an
OSHA approved device (refer to OSHA regulation 1910.147). RITE-HITE®Corporation 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
controls, make sure that the power source has
been locked out and tagged according to OSHA
regulations and approved local electrical codes.
Figure 1 - Lockout/Tagout
This is the highest level statement. Failure to
follow the listed instructions will most likely
result in severe injury or death.
IMPORTANT is used to draw attention
to a procedure that needs to be followed to
prevent machine or property damage.
This is a statement of serious hazard. Failure to
follow the listed instructions could place the
individual at risk of serious injury or death.
The statements used with this level of
warning deal with a safe operating
procedure. If the procedure is ignored, the
possibility of personal injury may exist.

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RITE-HITE®GWL-2300 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, and
•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.

Pub. No. 1177 - November 2010 5
The GWL-2300 vehicle restraint is a truck and trailer
locking system used to help secure trucks and trailers to
the face of a loading dock. The engagement mechanism
is positioned by the trailer as it approaches the loading
dock. The locking arm assembly, which blocks the rear
wheel of the truck or trailer, can then be engaged by
pressing the LOCK push button.
This prevents forward movement of the truck/trailer that
may create an unsafe void between the face of the dock
and the rear end of the truck/trailer as the forklift travels
from the loading dock onto the trailer; and creates an
obstruction noticeable (via outside lights) to the truck
driver, should the driver accidentally try to pull the truck/
trailer away while it is being serviced.
NOTE
There is no need to hold button to maintain its function.
Once a button is depressed, the GWL-2300 vehicle
restraint will lock or unlock for a preset time interval.
The normal mode of the restraint is the locking arm
assembly stored at the far end (away from the dock) with
the barrier arm on the approach. Inside lights should be
flashing red and outside lights should be flashing green.
The proper activation of the barrier and the locking
mechanism is monitored by:
•VISUAL CONTROL
– one set of flashing green and red lights located
inside the building for the dock personnel, and
one set located outside the building for the truck
driver. See Figure 2.
• AUDIO CONTROL
– a horn sounds inside the building, warning dock
personnel when the locking mechanism is not
properly activated. In this case, the truck or trailer
must be secured by other means (wheel chocks
etc.) prior to servicing the trailer. See Figure 3.
RITE-HITE®GWL-2300 Owner’s Manual
DEFINITION AND FUNCTION
Outside Light Box
With Red And
Green Lights
Inside Control Box
With Red And
Green Lights
FIGURE 3 - AUDIO CONTROLS
FIGURE 2 - VISUAL CONTROLS

See Figure 4 for locations of these features.
HYDRAULIC CYLINDER
Moves the Lifting Rails back and forth, thus raising or
lowering the locking pawl into place.
POWER UNIT ENCLOSURE
Houses the 120 VAC Hydrualic Power Unit and terminal
block assembly.
BARRIER SHAFT
The shaft which serves as the restraining obstruction in
front of the rearmost tire. It is connected to the locking
arm assembly.
BARRIER RAMP
The assembly that the barrier shaft stores in. Barrier
ramp is used to protect the barrier shaft when a
truck/trailer backs into place.
FRAME ASSEMBLY
The main weldment which is bolted onto the approach. It
acts as a guide/rail for the locking arm assembly, trigger
trolley, and lock trolley.
LOCKING ARM ASSEMBLY
The assembly which is rotated up into its UP position
when a trailer backs into the dock.
LOCKING ARM TROLLEY ASSEMBLY
Locking arm trolley assembly holds the locking arm
assembly to the frame and houses the pawl assembly.
LIFTING RAILS
The component which is pushed by the hydraulic cylinder.
It rides upon diagonal slotted plates along the frame. The
vertical motion drives the locking pawl into the ratchet.
PAWL ASSEMBLY Assembly
which is driven upward into the ratchet by the Lifting Rails
when the unit is locked.
TRIGGER ASSEMBLY
Component which is contacted by the rearmost tire of a
trailer. When a tire engages the trigger, it will pull the
locking arm assembly into its UP position, and pull the
locking arm assembly along the frame assembly.
TRIGGER TROLLEY ASSEMBLY
The trigger trolley assembly holds the trigger assembly to
the frame.
EXTENSION SPRINGS
The extension springs connect the locking arm trolley to
the trigger trolley.
LOCK SENSOR (SW1)
Communicates to the control box whether or not the unit
is locked. (Not shown, See page 26)
UNLOCK SENSOR (SW2)
Communicates to the control box whether or not the unit
is unlocked. (Not shown, See page 26)
PAWL HOLD DOWN
Mechanically senses if a trailer tire is present when the
locking arm is raised.
CONTROL BOX, OUTSIDE LIGHT BOX, AND
SIGNAGE The
combination of these components are uses to control the
function of the GWL-2300 Wheel Restraint and provide
audio/visual communication to the dock attendant and the
trailer driver.
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RITE-HITE®GWL-2300 Owner’s Manual
FEATURES

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RITE-HITE®GWL-2300 Owner’s Manual
Control
Box
Outside
Signs
Maintenance
Strut
Power Unit
Enclosure
Frame
Assembly
Lifting Rails
Hydraulic
Cylinder
Trigger
Assembly
Barrier
Ramp
Locking Arm
Assembly
Barrier Shaft
Pawl
Assembly
Locking Arm
Trolley Assembly
Trigger Trolley
Assembly
Side
Covers
Inside
Sign Anchor
Kit
Outside
Lights
Maintenance Strut
Storage Hooks
Extension Springs
Pawl
Hold Down
FIGURE 4 - FEATURES OF GWL-2300

Stored Position / Restraint UNLOCKED
If the GWL-2300 vehicle restraint is in the UNLOCKED
position (shaft assembly is down and stored in barrier
ramp), the Light Communication System should give the
following signals:
1. OUTSIDE light flashing GREEN, which indicates that
a vehicle may pull into or out of the loading bay.
2. INSIDE light flashing RED, which indicates that
loading or unloading is not permitted, since the truck
is not secured against the building. See Figure 5.
Restraint Locking, LOCK Button Pressed
It is assumed that the loading bay is empty (no truck).
The outside GREEN light and the inside RED light are
flashing, the barrier is down. A truck can now approach
the loading position. As the truck backs in, it will activate
the trigger, causing the locking arm to come up. The
mechanism will automatically adjust to the correct wheel
size. The truck will move locking arm and trolleys into
position automatically. When the truck is parked firmly
against the bumpers, the operator can lock the vehicle.
To lock the vehicle, the LOCK button must be depressed
momentarily. The outside light will change instantly from
flashing GREEN to flashing RED. The inside light will
remain steady RED until the locking mechanism is
engaged properly. Once it is engaged, the inside light will
change to flashing green. The truck may now be
serviced. The light communication and truck position are
shown in Figure 6.
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RITE-HITE®GWL-2300 Owner’s Manual
OPERATING PROCEDURES
Outside Lights
OUTSIDE LIGHT
STATUS
GREEN
Inside Lights
CONTROL BOX
STATUS
GWL-2300 POSITION
GREEN
RED
LOCK
UNLOCK
OVERRIDEHORN
3
2
1
RED
FIGURE 5 - STORED POSITION, INSIDE RED LIGHT AND OUTSIDE GREEN LIGHT

Pub. No. 1177 - November 2010 9
RITE-HITE®GWL-2300 Owner’s Manual
Outside Lights
OUTSIDE LIGHT
STATUS
RED
Inside Lights
CONTROL BOX
STATUS
GWL-2300 POSITION
GREEN
RED
LOCK
UNLOCK
OVERRIDEHORN
3
2
1GREEN
FIGURE 6 - TRUCK LOCKED AGAINST THE BUMPERS
Restraint LOCKED
If the GWL-2300 vehicle restraint is in the LOCKED
position with the barrier up and the locking mechanism
engaged properly, the Light Communication System
should give the following signals:
1. OUTSIDE light flashing RED, indicating that the truck
driver is not permitted to leave.
2. INSIDE light flashing GREEN, indicating that the
truck may now be loaded or unloaded. See Figure 6.
NOTE:
If testing without a trailer present, make sure to
manually separate trollies so pawl hold down is
disengaged.
Restraint UNLOCKING, UNLOCK Button
Pressed
In order to release the truck after completion of the
loading/unloading process, the UNLOCK pushbutton
must be pressed. The inside light will turn instantly to
steady RED, while the outside light remains flashing
RED until the locking mechanism is disengaged. The
outside light will turn to flashing GREEN, allowing the
truck to depart. The truck will automatically move the
locking arm to the stored position when departing.
On occasion the truck/trailer may move forward
during servicing putting pressure on the pawl
assembly. If an unlock “Fault” occurs the
truck/trailer may need to be positioned firmly
against the dock bumpers to release the
pressure on the pawl assembly.

10 Pub. No. 1177 - November 2010
RITE-HITE®GWL-2300 Owner’s Manual
FAULT State From LOCKING State
In case the locking mechanism can not engage properly,
the alarm will sound. The outside and inside lights will
show flashing RED. The light communication, alarm and
truck position are shown in Figure 7.
HORN OVERRIDE State, HORN OVERRIDE
Code Entered after Securing Trailer by
Alternate Means
The horn may be silenced AFTER the trailer has been
secured by other means. This can be done by entering
the horn silence code. Both inside lights will now flash
(red and green) and all control buttons are inactive. See
Figure 8. Once service is completed, enter the horn
silence code and press the unlock push button. The
truck/trailer may now depart once GWL-2300 unlocks.
Outside Lights
OUTSIDE LIGHT
STATUS
RED
Inside Lights
Horn
CONTROL BOX
STATUS
GWL-2300 POSITION
RED
LOCK
UNLOCK
OVERRIDEHORN
3
2
1GREEN
FIGURE 7 - FAULT MODE, TRUCK NOT PROPERLY LOCKED, HORN ON
Outside Lights
OUTSIDE LIGHT
STATUS
RED
Inside Lights
CONTROL BOX
STATUS
GWL-2300 POSITION
GREEN
RED
LOCK
UNLOCK
OVERRIDEHORN
3
2
1
GREEN
FIGURE 8 - FAULT MODE, TRUCK NOT PROPERLY LOCKED, HORN SILENCED
Before operating “HORN OVERRIDE”, secure
trailer by other means.

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RITE-HITE®GWL-2300 Owner’s Manual
VEHICLE RELEASE DURING LOSS OF POWER
During loss of power, the GWL-2300 vehicle restraint will
not automatically disengage the vehicle being serviced.
The truck must be manually released by the following
method. See Figure 9.
PROCEDURE
1. Lockout/Tagout controls.
2. Remove pin which connects the hydraulic cylinder to
the Lifting Rails. See figure 9.
3. Place pry bar in hole between end of lifting rail and
frame hole as shown in figure 10. Pry away from the
dock, lowering the lifting rails and disengaging the
locking pawl.
4. Do not use equipment until reassembled.
FIGURE 9 - MANUALLY RELEASING TRUCK FIGURE 10 - LOCK RAILS LOWERED
Do not remove lock arm when a truck tire is
present.
Place Pry Bar In Hole And
Pry Away From Dock
Remove
Pin Lifting
Rail

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RITE-HITE®GWL-2300 Owner’s Manual
SNOW REMOVAL PROCEDURE
In the event of snow fall, please follow the procedure
below to clear and remove snow from the truck approach.
PROCEDURE
1. Using the service strut, move the locking arm
assembly all the way towards the dock face. See
Figure 11.
2. Back drag snow from the approach. Be sure not to hit
the wheel guides, locking arm assembly, trigger,
barrier ramp and frame assembly with the plow.
3. Return the locking arm assembly to the stored
position after completion of snow removal.
4. Remove snow against dock by alternate means
(shovel, snowblower, etc.).
5. Manually clean on and around unit to prevent ice
build-up.
RECOMMENDED LIQUID DE-ICER
Any Calcium-Cloride based liquid de-icer.
Engage Locking Arm Assembly With Service Strut
Service
Strut
Move To Rearmost Position
Return To Stored Position
FIGURE 11 - SNOW REMOVAL
Wheel guides, locking arm assembly, trigger, or
frame assembly may be buried underneath
snow, thus not visible. Unseen obstructions
may cause damage to equipment and/or bodily
harm during snow removal if they should come
into contact with the snow removal equipment.

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 dirt, snow, ice and debris around GWL-2300
vehicle restraint.
2. Verify inside, outside lights and horn are working.
3. Replace damaged or missing light bulbs and lenses.
4. Repair, remount, or replace outside and inside signs
as required.
5. Inspect dock bumpers. Missing bumpers must be
replaced.
90 DAYS
1. Perform all Daily maintenance.
2. Grease rollers at fittings located on both sides of
trolleys (8 places), lock arm trolley pin and barrier
roller. See Figure 23. Use Mobilith SHC220 No. 2
grease (or equivalent temperature range lithium
based grease). Two (2) to three (3) pumps at
subsequent 90 Day maintenance intervals.
3. Lubricate Pawl Guide Shaft with a Dry Spray
Lubricant - DO NOT USE Moly-Based Grease.
4. Check the trigger and rollers for damage, ensure
rollers spin freely.
5. Check brushes on trolleys and replace as necessary.
6. Inspect outside junction box, light box and power unit
enclosure. They should be rigidly mounted. If loose or
damaged, inspect all wires and wire connections.
7. Inspect flexible conduit from GWL-2300 vehicle
restraint to junction box. Look for kinks, crushed
areas, etc.
8. Perform operational test after all maintenance repairs
are complete.
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RITE-HITE®GWL-2300 Owner’s Manual
MAINTENANCE
(BASED ON TYPICAL APPLICATIONS OF 8 TRUCKS PER DAY)
Grease Barrier Roller
At Fitting -
Use Mobilith SCH220
No. 2 Grease
Grease Rollers (8) At Fittings -
Use Mobilith SCH220
No. 2 Grease
Both Sides
Grease Trolley Pin
At Fitting -
Use Mobilith SCH220
No. 2 Grease
Lubricate Pawl Shaft
Dry Lubricate Only - DO NOT USE Moly Based Grease
FIGURE 12 - LUBRICATION
When working with electrical or electronic
controls, make sure that the power source has
been locked out and tagged according to OSHA
regulations and approved local electrical codes.
Post safety warnings and barricade work area,
at dock level and at ground level, to prevent
unauthorized use of the dock position.
A safe work place requires all lights and the
horn to be working properly. DO NOT use
GWL-2300 vehicle restraint if parts are broken
or missing.
Maintenance may be required more frequently
at loading docks exposed to harsh
environments (extreme climates, corrosive
chemicals, frequency of usage exceeding 8
trucks per day, etc.). Consult RITE-HITE if these
conditions exist for accelerated maintenance
requirements.

180 DAYS
1. Do all the Daily and 90 Day maintenance.
2. Tighten the anchor bolts to 100 ft-lbs.
3. Check barrier roller tube for damage.
4. Check if all the bolts on the UHMW strip are tight.
5. Manually push the locking arm weldment along the
length of the frame to verify smooth operation. If
sticky, check for proper lubrication.
360 DAYS
1. Do all Daily, 90 and 180 Day maintenance.
2. Operate unit in (5) different places to ensure the
locking mechanism engages properly.
3. Disassemble both the locking arm and trigger trollies
and inspect internal sliders for wear. Replace as
necessary. See Figure 13.
4. Inspect wear pads in locking arm assembly. See
Figure 13.
5. Inspect pawl mechanism for wear on sliders.
6. Inspect bronze tooth on locking pawl.
7. Verify decals are present and legible, replace as
required.
8. Inspect lifting rail bushings for wear and replace if
worn through to pin hole. Do not lubricate slots in
frame.
14 Pub. No. 1177 - November 2010
RITE-HITE®GWL-2300 Owner’s Manual
Frame
Wear Strips
Steel
Trolley Sliders
Wear Pads
Pawl
UHMW Blocks
And Slider
Bronze Tooth
Lifting Rail Bushing
5 ea. on Rail
FIGURE 13 - INSPECTION
Dock equipment must be protected by 4" thick
bumpers. WORN, TORN, LOOSE, OR MISSING
BUMPERS MUST BE REPLACED.

Pub. No. 1177 - November 2010 15
RITE-HITE®GWL-2300 Owner’s Manual
TROUBLESHOOTING
Problem Probable Cause Remedy
1. Cylinder does not extend when Motor circuit breaker tripped, or bad. Replace or reset.
LOCK pushbutton is pushed. NOTE: A motor fuse is not required,
unit uses circuit breaker only.
Power unit power supply. Check voltage at transformer,
bridge rectifier, etc.
Hydraulic system Check fluid level and hydraulic lines
for leaks.
2. No lights, but 120V at transformer. Blown control fuse. Replace fuse.
3. Unit goes into fault about 8 seconds Bad SW1 (Lock sensor). Replace SW1 (lock sensor).
after LOCK pushbutton is pushed, SW1 wiring. Verify wiring per electrical
with actuator moving. schematic on page 11 or 12.
Bronze “snaggle” tooth on pawl Disassemble locking arm trolley and
is damaged. replace snaggletooth if required.
Barrier is to low, pawl is not Back trailer firmly against bumpers.
engaging rack. Trailer bogeys may be too far
forward to service.
To prevent personal injury use extreme care
when working with electrically powered
equipment. Follow all safety instructions.
Disconnect all power, and keep body away from
moving parts. Use caution with compressed air;
foreign materials can be blown through the skin
or into the eyes. Use only OSHA approved air
nozzles and do not exceed recommended air
pressure.
When working with electrical or electronic
controls, make sure that the power source has
been locked out and tagged according to OSHA
regulations and approved local electrical
codes.

COMPONENT TESTING
Sensing Switch Test Procedure
1. Set multimeter to “RX1” scale for “Continuity Test”.
2. Attach multimeter leads to white and black wires of
mag. reed switch connector. You should have:
— no magnet present — no meter reading.
— magent present — a “Full Scale” meter reading.
Motor Test Procedure
1. BAD O/L: Little or infinite ohm reading (no needle
movement) between lead 1 and 2, 1 and 3. Set
multimeter to ohms.
2. OPEN WINDING: Infinite ohms (no needle
movement) between lead 2 and 3. Check between
leads 1 and 2 or 1 and 3 to determine which winding
is open.
3. MECHANICAL BINDING: Motor hums. Motor leads
show continuity between all windings. Hydraulic
cylinder does not move.
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Sensing
Switch
Magnet
Black
White
(LED Off)
(LED Off)
(LED On)
(LED On)
FIGURE 14 - SENSING SWITCH TEST AND SWITCH/BARRIER POSITION CHART
multimeter
G
1
2
3
hydraulic power unit
FIGURE 15 - MOTOR TEST

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LED STATUS CHART
FIGURE 16 - LED STATUS CHART
LED Inputs LED Outputs
STORED (UNLOCKED) F T - - - P F F P F F F F * T
LOCKING F F M - - P F P F F T F F * T
LOCKED T F - - - F P P F F F F T * T
STORING (UNLOCKED) F F - M - T F P F F F T F * T
PAWL FAULT F F - - - P F F F P F F F * F
HORN SILENCED ? ? - - M P P P F F F F T * T
SWI = MAG RES 1 (LOCK) ISR = Inside Red Light
SW2 = MAG RES 2 (UNLOCK) ISG = Inside Green Light
LOCK PB = Lock Push Button OSR = Outside Green Light
UNLOCK PB = Unlock Push Button OSG = Outside Green Light
PB1, 2, &3 = Horn Silence Code Push Button HORN = Alarm Horn
PAWL FAULT = SW1 did not sense a safe M1L = Motor Up output
LOCK/UNLOCK M2L = Motor Down Output
CR1 = Green Light Interlock Output
CR2 = Unidox Output
CR3 = Security System Output
T = Steady On
D = Double Pulse
F = Off
P = Pulsing/Flashing
* = True when Unidox is enabled
? = Varies depending on operation
SW1 SW2 LOCK PB UNLOCK PB PB1,2 & 3 ISR ISG OSR OSG HORN M1L M2L CR1 CR2 CR3

SETTING HORN OVERRIDE CODE
1. Press and hold DIAGNOSTIC button until horn
chirps (approximately three seconds).
2. Enter the factory preset HORN OVERRIDE
code:1223.
3. Enter the new HORN OVERRIDE code. The code
can be one to four numbers in length.
4. Once the new code has been entered, press the
LOCK button.
5. Controls reset with new HORN OVERRIDE code
enabled.
If no buttons are pressed within a five minute period, the
controls will automatically retain the previous code. To
exit the HORN OVERRIDE code set mode at any time,
press the DIAGNOSTIC button.
If code has been forgotten, follow the above procedures
and enter a new code.
DIAGNOSTICS
Diagnostic mode may be entered while the restraint is in
any state. To enter diagnostic mode:
1. Press and hold DIAGNOSTIC button until it chirps
(approximately 3 seconds).
2. Press the LOCK button.
3. Press the UNLOCK button.
4. The horn chirps and the outside light is flashing red.
The controls are in the first step of diagnostic mode.
NOTE: The outside red light will remain flashing at
all times except Step 5.
5. Start at Step 1 in the Diagnostic Table. If the
equipment Outputs do not match the table, use the
Troubleshooting section on page 15.
If no buttons are pressed within a five minute period, the
controls will automatically exit the diagnostic mode. To
exit the diagnostic mode at any time, press the
DIAGNOSTIC button.
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HORN OVERRIDE CODE AND DIAGNOSTICS
Operator Action Outputs Troubleshooting
Step 1 Press LOCK - Go to Step 2 Outside red light is flashing. Check light bulb and wiring.
OSR LED is flashing. Check CPU module and 1 amp fuse.
Step 2 Press UNLOCK - Go to Step 1 Inside red light is ON. Check light bulb and wiring.
Press LOCK - Go to Step 3 ISR LED is ON. Check CPU module and 1 amp fuse.
Step 3 Press UNLOCK - Go to Step 2 Inside Green light is ON. Check light bulb and wiring.
Press LOCK - Go to Step 4 ISG LED is ON. Check CPU module and 1 amp fuse.
Step 4 Press UNLOCK - Go to Step 3 Inside amber light is ON (if Check light bulb and wiring.
not equipped, go to Step 5).
Press LOCK - Go to Step 5 ISA LED is ON. Check CPU module and 1 amp fuse.
Step 5 Press UNLOCK - Go to Step 4 Outside red light is ON. Check light bulb and wiring.
Press LOCK - Go to Step 6 OSR LED is ON. Check CPU module and 1amp fuse.
Step 6 Press UNLOCK - Go to Step 5 Outside green light is flashing. Check light bulb and wiring.
Press LOCK - Go to Step 7 OSG LED is flashing. Check CPU module and 1 amp fuse.
Step 7 Press UNLOCK - Go to Step 6 Horn is ON. Check horn and wiring. Test horn
Press LOCK - Go to Step 8 HRN LED is ON. applying 12V DC power.
Check CPU module and 1 amp fuse.
Step 8 Press UNLOCK - Go to Step 7 CR1 LED is ON. (If option Check Option module.
Press LOCK - Go to Step 9 card installed, go to Step 12).
Step 9 Press UNLOCK - Go to Step 8 CR2 LED is ON. Check Option module.
Press LOCK - Go to Step 10
Step 10 Press UNLOCK - Go to Step 9 CR3 LED is ON. Check Option module.
Press LOCK - Go to Step 11
Step 11 Press UNLOCK - Go to Step 10 Outside red light is flashing. See Step 1.
Press LOCK - Go to Step 12 OSR LED is flashing.

Steps 12 – 15 are used to test the mechanical Inputs and
Outputs of the lock (i.e. motor, sensors, etc.). The horn
will chirp when the controls enter Steps 12 – 15 to alert
the operator to check the hook position. If the sensor
does not read the appropriate input, the horn will double
pulse and the inside red light will be ON.
NOTE
Barrier must be in the up position and trolleys separated
for Steps 12 – 15. See Figure 17.
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RITE-HITE®GWL-2300 Owner’s Manual
FIGURE 17 - BARRIER RAISED FOR TESTING
Operator Action Outputs Troubleshooting
Step 12 Press LOCK - Go to Step 13. Cylinder retracts to stored Check power unit, verify wiring, verify
position. hydraulic system.
SW1 LED is OFF. Check switch 1 and verify wiring.
SW2 LED is ON. Check switch 2 and verify wiring.
Inside red light is ON. See Step 2.
Outside red light is flashing. See Step 5.
Step 13 Press LOCK - Go to Step 14. Cylinder extends to fault Check power unit, verify wiring, verify
position hydraulic system.
SW1 LED is OFF. Check switch 1 and verify wiring.
SW2 LED is OFF. Check switch 2 and verify wiring.
Step 14 Press LOCK - Go to Step 16. Cylinder extends to lock Check power unit, verify wiring, verify
position. hydraulic system.
SW1 LED is ON. Check switch 1 and verify wiring.
SW2 LED is OFF. Check switch 2 and verify wiring.
Step 15 Press LOCK - unit will unlock, ___ ___
and controls exit Diagnostic
mode.

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ELECTRICAL SCHEMATIC (STANDARD)
motor
lock
motor
unlock
no fuse
required
diagnostic
button
CPU
module
(5) (6) (7)
ground lugs
NOTE: Use included female
spade connectors for
installation.
LEGEND
label LED lamp
denotes field wiring
5631D028
outside light
POWER
outside light GREEN
outside light RED
(42)
(41)
(40)
to option module
motor
common
to customer power supply,
120V, 60Hz, 30 amp
fused disconnect with 10 amp
non-time delay fusing
(supplied by others)
ground
lugs
power
module
1A, 250V
control
fuse
(3)
(2)
(1)
12VDC, 2.1A
12VDC, 2.1A
56 7 Located in frame
mounted enclosure
“LOCKED”
Sensor Switch
(SW1)
white
black
black
white
“UNLOCKED”
Sensor Switch
(SW2)
FIGURE 18 - ELECTRICAL SCHEMATIC (STANDARD)