RITE-HITE Wheel-Lok GWL-2300 User manual

GWL-2300®
Vehicle Restraint
Owner’s Manual
Printed in U.S.A. by RITE-HITE®Print Shop Publication No. 1177
Copyright 2003 RITE-HITE®Febuary 2003
SERIAL NO. GW231001 & UP

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Pub. No. 1177 - Febuary 2003
RITE-HITE GWL-2300 Owner’s Manual
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . 2
SAFETY WARNINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
OWNER RESPONSIBILITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
DEFINITION AND FUNCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
INSTALLATION INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
ELECTRICAL SCHEMATIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . 15
OPERATING PROCEDURES & TESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
MAINTENANCE (BASED ON TYPICAL APPLICATIONS OF 8 TRUCKS PER DAY). . . . . . . . . . . . . . . . . . . . . . . . 23
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
HORN OVERRIDE CODE AND DIAGNOSTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
REPLACEMENT PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
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: 4,531,248;
4,560,315 (RE: 32,968); 4,570,277; 4,605,353 (RE: 33,154); 4,634,334; 4,692,755; 4,744,121; 4,819,770; 4,843,373;
4,865,507; 4,920,598; 4,995,130; 5,040,258; 5,111,546; 5,212,846; 5,271,183; 5,299,386; 5,311,628; 5,323,503;
5,375,965; 5,440,772; 5,442,825; 5,453,735; 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; 6,065,172; 6,070,283; 6,074,157; 6,085,375; 6,092,970;
6,106,212; 6,116,839; 6,190,109; 6,220,809; 6,627,016; 6,238,163; 6,322,310; 6,311,352; 6,360,394; 6,368,043,
6,431,819; and pending U.S. and foreign patent applications. RITE-HITE®, LEVEL-RITETM, GUARDRITE®, SAFE-T-
LIP®, HYDRACHEK®, WHEEL-LOKTM , DOK-LOK®, DUAL-DOK®, and SAFE-T-GATE®are trademarks of RITE-HITE®
Corporation.

RITE-HITE GWL-2300 Owner’s Manual
SAFETY WARNING
Pub. No. 1177 - Febuary 2003
3
LOCKOUT/TAGOUT PROCEDURES
The Occupational Safety and Health Administration (OSHA) requires, in addition to posting safety warnings and
barricading 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.
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.
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 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.
Figure 1 - LOCKOUT/TAGOUT

OWNER RESPONIBILITY
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Pub. No. 1177 - Febuary 2003
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 presonnel 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
restrainting 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.

DEFINITION AND FUNCTION
RITE-HITE GWL-2300 Owner’s Manual
Pub. No. 1177 - Febuary 2003
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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 Controls – 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 Controls – 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.
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)
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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Pub. No. 1177 - Febuary 2003
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
FIGURE 4 - FEATURES OF GWL-2300

INSTALLATION INSTRUCTIONS
RITE-HITE GWL-2300 Owner’s Manual
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Pub. No. 1177 - Febuary 2003
The performance of any machine can be no better than
the installation and application. The GWL-2300 vehicle
restraint requires only ordinary application and
installation skills using good workmanship and quality
materials.
Follow the 7-step Installation Procedure:
1. Inspect GWL-2300 vehicle restraint components.
2. Install GWL-2300 vehicle restraint frame assembly.
3. Install wheel guides.
4. Install barrier ramp.
5. Install electrical components.
6. Fill and bleed hydraulic system.
7. Install signs.
8. Test operation.
INSPECT COMPONENTS
Open and inspect all materials. Refer to Figure 4.
Immediately report any damage or material shortage.
Study component assemblies and determine their
proper locations. Refer to Figures 30 - 39.
GWL-2300 VEHICLE RESTRAINT POWER
SOURCE
On occasion, the incoming electrical power for the
GWL-2300 vehicle restraint is taken from a convenient
nearby electrical appliance, i.e., overhead door opener.
Generally, there is no problem using this sort of power
source; you must, however, verify that the amperage is
in accordance with local and federal codes.
The GWL-2300 vehicle restraint requires 120V, single
phase 60 Hz power and 5 amps of current. Four (4)
GWL-2300 vehicle restraints can be hooked into one (1)
20 amp feeder circuit per the current N.E.C. Paragraph
#430-53.
WHEN IN DOUBT, CALL YOUR RITE-HITE
REPRESENTATIVE OR RITE-HITE AT [phone].
Post safety warnings and barricade work area,
at dock level and at ground level, to prevent
unauthorized use of the dock position. 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.
All components must be connected to a
SAFETY EARTH GROUND where indicated. The
SAFETY EARTH GROUND must conform to the
current National Electric Code Section 250-81
section (a) or section (c) for a grounding
electrode system.

RITE-HITE GWL-2300 Owner’s Manual
Pub. No. 1177 - Febuary 2003
9
CONCRETE APPROACH REQUIREMENTS
Verify the approach meets the following criteria:
1. The approach must be concrete, 137" wide by 300"
long x 6" minimum thickness. See Figure 5.
2. The approach must be free of discontinuities (such
as cracks, potholes, etc.) greater than 1/4" where
the trigger will travel. In addition, the trigger must
not travel more than 1" below the base plate of the
rail assembly without surface preparation under
trigger path. See Figure 6, Section A-A.
3. The GWL-2300 vehicle restraint can be installed
and shimmed up to 1" without modification. If
greater than 1" of shimming is necessary, longer
anchors and trigger bridge plate will be required.
Please consult RITE-HITE.
TRENCH DRAINS
1. If the GWL-2300 vehicle restraint crosses a trench
drain parallel to the dock face, the drain grate must
be bridged with a 1/4" thick steel plate where the
trigger will travel.
2. If the trench drain lies in the same position as a
GWL-2300 vehicle restraint anchor plate, a steel
plate must be welded to the mounting pad and
anchored to the approach. See Figure 6.
Never weld on the GWL-2300 vehicle restraint
when the electrical components are connected
to the main control box and the power to the
box is “ON”. Electrical current from the welder
can “FEED BACK” through the circuit and could
cause injury or damage electrical components.
137"
Ref.
300"
Dock
Face 68-1/2"
C
L
68-1/2"
FIGURE 5 - CONCRETE PAD

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RITE-HITE GWL-2300 Owner’s Manual
INSTALLATION OVER A TRENCH DRAIN AND SHIMMING INSTRUCTIONS
Rearmost
Trench Drain
Position
Bridge Plate
For Trigger
Travel Path
If Necessary.
Anchor And
Weld In-place
1/4"Typ.
16"
11-1/2"
Bridge Plate For
Trench Drains 1/4" Plate
Steel. Plate Width Must
Be 1/2" Wider Than
Mounting Plate To Allow
For Welding. Plate
Length Determined By
Location And Width
Of Drain.
C
L
55"
Ref.
C
L
Approach
Bumper Face
A
A
Shim Middle Frame Bar
Full Depth To Approach
17-1/2" To
Front Of Rear
Base Plate
Rearmost
Trench Drain Position Frontmost
Trench Drain Position
Trigger
Travel Path
Locate Anchor Tabs Away From
Trigger Travel Path. Anchor
Mounting Holes Must Be A Minimum
3" From Edge Of Trench Drain.
Locate Anchor Mounting Tabs On Both Sides Of Trench Drain
If Welding To GWL-2300 Mounting Plate Is Not Possible.
Shim Material Is Required If Welding
To GWL-2300 Frame Bar Plate
Section A-A
Side View
Top View
1" Max.
Allowable
Trigger
Approach
Shims
1/4"Typ.
Frontmost
Trench Drain
Position
Tube And I-Beam
Must Remain Parallel
Bevel Plate
Edges To Prevent
Roller Damage
Assembly
Level frame over
each base plate
FIGURE 6 — INSTALLATION OVER A TRENCH DRAIN AND SHIMMING
A maximum shimming of 1" thickness is
permitted for installations of the GWL-2300.
Make sure that solid metal shims are used.
Shims must fully support the mounting plate
and are secured in place with the mounting
anchors. Use the holes in the mounting plate
as a drilling guide. Consult RITE-HITE
Applications where more than 1" of shimming
is required.