RITE-HITE VBR-300 Dok-Lok User manual

Printed in U.S.A Publication No. 1160
© 2001
RITE-HITE Corp. September 2001
Owner’s Manual
Serial No. VB3001000 and UP

2
RITE-HITE VBR-300 DOK-LOK Owner’sManual
Table ofContents
Introduction ................................................................................. 3
Owners Responsibility . . . . . . . . ................................................................. 4
DefinitionandFunction......................................................................... 5
Features .................................................................................... 5
TypicalInstallationViews ....................................................................... 7
Installation/ApplicationInformation ................................................................ 7
WiringDiagram ............................................................................. 12
ElectricalSchematic(Standard) ................................................................. 13
ElectricalSchematic(Optional).................................................................. 14
OperatingProcedure ......................................................................... 15
Maintenance................................................................................ 19
Troubleshooting ............................................................................. 20
ReplacementParts ........................................................................... 24
Patents
The
RITE-HITE
®products in this manual are covered by one or more of the following U.S. patents: 4,379,354; 4,443,150;
4,472,099; 4,560,315 (RE: 32,968); 4,605,353 (RE: 33,154); 4,634,334; 4,692,755; 4,843,373; 5,212,846; 5,297,921; 5,375,965;
5,453,735; 5,531,557; 5,553,987; 5,582,498; 5,664,930; 5,702,223; 5,762,459; 5,882,167; 5,964,572; 6,010,297; 6,074,157;
6,092,970; 6,106,212; 6,116,839; 6,190,109 and pending U.S. and foreign patent applications.
TrademarkAcknowledgements
RITE-HITE
®,
GUARDRITE
®,
SAFE-T-LIP
®,
HYDRACHEK
®,
WHEEL-LOK
™,
DOK-LOK
®,
DUAL-DOK
®,
SAFE-T-STRUT™,
and SAFE-T-GATE
™ are trademarksof
RITE-HITE
®.

RITE-HITE VBR-300 DOK-LOK Owner’sManual
3
Safety Warnings
LOCKOUT/TAGOUTProcedures
The Occupational Safety and Health Administration (
OSHA
)
requires, in addition to posting safety warnings and barricading
the workarea (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 underway 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.
Safety Conventions
Introduction
Read and understand this manual before attempting to install
or operate any
DOK-LOK
vehicle restraint. For best results,
have this product serviced by your authorized
RITE-HITE
representative.
The VBR-300
DOK-LOK
vehicle restraint by
RITE-HITE
is
intended to provide a safer workplace for workers in shipping
and receiving dockareas. The VBR-300
DOK-LOK
vehicle
restraint is a hydraulic restraint device that, when properly
installed and operated, retains a secure connection between
the truckand dock. Signal lights, warning horn and signs
provide instructions to the truckdriver and
DOK-LOK
vehicle
restraint operator that a safe condition exists. The
DOK-LOK
vehicle restraint is operated by pressing push buttons on an
inside control panel.
NoticetoUser
Your local
RITE-HITE
representative provides the Planned
Maintenance Program (P.M.P.) which can be fitted to your
specific operation. Call your local representative or
RITE-HITE
at [phone].
Figure 1 : LOCKOUT/TAGOUT
When workingwith electrical or electroniccontrols,
makesurethatthepower sourcehas been locked out
and tagged accordingto
OSHA regulations and
approved local electrical codes.
DANGER
This is thehighestlevel statement.Failure tofollow
thelisted instructions will mostlikelyresultin severe
injuryor death.
This is a statementofserious hazard. Failure to
follow thelisted instructions could placethe
individual atriskofserious injuryor death.
Thestatementsusedwith this level ofwarningdeal
with asafeoperatingprocedure. If theprocedure is
ignored,thepossibility ofpersonal injurymayexist.
IMPORTANTis used todrawattention toaprocedure
thatneeds tobefollowed topreventmachine
damage.
DANGER
WARNING
CAUTION
IMPORTANT

4
RITE-HITE VBR-300 DOK-LOK Owner’sManual
Owners Responsibility
The following information is presented in
ANSI
Publication
MH30.1-2000 Section 4 Safety Requirements and
Considerations. The owner’s responsibilities include the
following:
1. The owner should recognize the inherent danger of the
interface between dockand transport vehicle. The
owner should, therefore, train and instruct operators in
the safe use of dockleveling devices 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 inspection
procedures,
— Maintenance procedures,
— Operating instructions,
— Descriptions or specifications for replaceable or
repairable parts,
— Tables to identify the grade (slope) for all variations
of length or configuration of the dockleveling
device, 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 dockleveling device.
2. When a transport vehicle is positioned as closely as
practicable to a dockleveling device, there should be at
least 4"(100 mm) of overlap between the front edge of
the lip and the edge of the floor or sill of the transport
vehicle.
3. Nameplates, cautions, instructions, and posted
warnings shall not be obscured from the view of the
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. Dockleveling devices that are structurally damaged or
have experienced a sudden loss of support while under
load, such as might occur when a transport vehicle is
pulled out from under the dockleveling device, shall be
removed from service, inspected by the manufacturer’s
authorized representative, and repaired as needed
before being placed backin service.
6. The manufacturer shall supply replacement nameplates,
cautions or instruction labels, and operating and
maintenance manuals upon request of the owner. The
owner shall see that all nameplates and caution and
instruction markings or labels are in place and legible
and that the appropriate operating and maintenance
manuals are provided to users.
7. Modifications or alterations of dockleveling devices shall
be made only with written permission of the original
manufacturer. These changes shall be in conformance
with all applicable provisions of this standard and shall
be at least as safe as the equipment was before
modification. These changes shall also satisfy all safety
recommendations of the original equipment
manufacturer for the particular application of the dock
leveler.
8. 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 positive restraints that provide the
equivalent protection of wheel chocks engaged.
NOTE
:TheMH30 Committee recognizes the devices
intended to secure a transport vehicle to a loading
dockby mechanical means. However, no standards
currently exist for the strength, construction or
attachment of the underride guard on a transport
vehicle. It is therefore recommended that users of
such positive restraint devices review the:
— Means of attachment to the transport vehicle,
— Strength of the overall connection,
— Proper coordination of the actuation of devices
with any signaling system used, and
— Need to use wheel chocks.
9. In selecting dockleveling devices, it is important to
consider not only present requirements but also future
plans or adverse environments.

RITE-HITE VBR-300 DOK-LOK Owner’sManual
5
Definition and Function
The VBR-300
DOK-LOK
vehicle restraint is a hydraulic,
ground stored restraint device used to secure trucksandsemi-
trailers with an intact Rear Impact Guard (R.I.G.) to the face of
a loading dock.ThisisachievedbysecuringtheR.I.G.witha
hydraulically powered steel barrier. This prevents forward
movement of the truck/trailer that may create an unsafe void
between the face of the dockand the rear end of the truck/
trailer as a forklift travels from the loading dockonto the trailer;
or to create an obstruction noticeable to the truckdriver, should
the driver accidentally try to pull the truck/trailer away while it is
being serviced.
Theproperorimproperactivationofthebarrierismonitored
by:
•VISUALCONTROL
— One set of flashing green or red lights located at the
inside of the building for the forklift operator, and one
set located outside of the building for the truckdriver. In
addition to the lights, there are three instruction signs.
• AUDIO CONTROL
— A horn will sound at the inside of the building, warning
the forklift operator if there is no R.I.G.present,orifthe
engagement is improper. In this case, the trailer must
be secured by other means (wheel chocks, etc.) prior to
servicing trailer.
Prerequisite for proper barrier engagement is that the trailer is
parked firmly against a 4"(trade standard) thickdockbumper.
The activation/deactivation is solely controlled from the inside
of the building by momentarily depressing either the Lock
(raise) button or the Unlock(lower) button.
The normal mode of the barrier is in the lower STORED
position, showing a flashing red light (trailer not secured) at the
inside of the building and a flashing green light (trailer free to
move to or away from the loading dock) at the outside of the
building.
Once the trailer is parked, the dockattendant will depress the
Lockbutton. This will raise the barrier to engage the R.I.G.As
soon as the R.I.G. is properly locked, there will be
simultaneous light change — the inside will change from red to
green flashing (trailer secured) and the outside will change
from green to red flashing (do not move trailer). After the
service is completed, the dockattendant will have to depress
the Unlockbutton which then will return the barrier to its lower
STORED position.
A proper barrier engagement is achieved when the barrier
raises unobstructed to secure the horizontal cross member of
the R.I.G. Assembly. An improper barrier engagement is if the
horizontal cross member of the R.I.G. is missing, obstructed or
it is bent or located so far toward the rear axle of the trailer that
it will prevent the free passage of the barrier. In either case, the
lights will stay in a non-serviceable mode and a horn will
sound. At this point, the trailer must be secured by other means
(example: wheel chocks) in order to become serviceable.
Features
Refer to
Figure 2, page 6
for the locations of the following
features:
R.I.G.
Acronym used for the Federally mandated
rear impact
guard
located on the rear of over the road trailers to
prevent accidental underride by automobiles.
Roller Track Assembly
Mounted to the loading dockwall to guide the barrier
assembly in a vertical plane and transmit the creep or pull
out force from a trailer to the loading dockwall.
Barrier Roller Assembly
Comprised of a steel roller housing, a pre-lubricated
needle bearing to allow easy movement of the barrier
assembly.
FloatMechanism
Allows barrier to move downward once engaged to
maintain contact with the R.I.G. while servicing a trailer.
R.I.G. Sensor
Detects when the barrier is secured to the R.I.G.
Barrier Assembly
Secures R.I.G. to prevent trailer from rolling/creeping away
from the dock.
HydraulicAssembly
Provides means of moving the barrier between its stored
and active positions.
Base Cover
Protects the barrier assembly, float mechanism, hydraulic
hoses and lift cylinder from debris.
Track Cover with Integral LipGuide
Keeps debris out of the roller track. Integral lip guide is
used to guide the lip past the roller trackassembly in a
below dockend load condition.
SensingSwitches,Control Box, Outside Light Boxand
Signage
Combination of these components is used to control the
VBR-300
DOK-LOK
vehicle restraint and provide audio/
visual communications to the dockattendant and trailer
driver.

6
RITE-HITE VBR-300 DOK-LOK Owner’sManual
Figure 2
:VBR-300 DOK-LOK Features

RITE-HITE VBR-300 DOK-LOK Owner’sManual
7
Typical Installation Views
Installation/Application Information
A
DOK-LOK
vehicle restraint may be installed on dockswithor
without levelers. Consult
RITE-HITE
for proper application.
Follow the seven (7) step installation procedure below:
1. Inspect
DOK-LOK
vehicle restraint materials.
2. Assemble trackto base.
3. Install
DOK-LOK
vehicle restraint to dockface.
4. Install hydraulic components.
5. Install electrical components.
6. Fill and bleed hydraulic system.
7. Install signs.
8. Test operation.
Inspect DOK-LOK Materials
Open and inspect all materials. Refer to
Figure 2
. Immediately
report any damage or material shortage. Study component
assemblies and determine their proper locations. Refer to
Figure 26, page 24
through
Figure 29, page 30
.
Assemble Track To Base
The VBR-300
DOK-LOK
vehicle restraint can be assembled
with a 29"or 27"maximum height. Refer to the
RITE-HITE
Application Information provided with the
DOK-LOK
vehicle
restraint for correct height. Follow the steps below to assemble
roller trackto base.
1. Remove tape securing the barrier rollers to the barrier.
2. Position barrier in the bottom of the roller trackwith
barrier rollers installed.
Figure 3
: Flush Mount VBR-300 DOK-LOK with Leveler in Recessed Pit
Postsafety warningsandbarricade workarea,at
dock level and atground level,toprevent
unauthorized use ofthe dock position.
Whether thereisaleveler or not, a4" thick bumper is
required. DONOTinstall a
DOK-LOK vehicle restraint
on dockswithout4"thick bumpers. For thicker
bumpers consultfactory.
DANGER
IMPORTANT
Figure 4
: Remove Tape Holding Rollers To Barrier

8
RITE-HITE VBR-300 DOK-LOK Owner’sManual
3. Attach base to roller trackusing (2) 3/4"bolts and nuts
(supplied by others). Use bottom set of holes for a 29"
mounting height and top set of holes for a 27"mounting
height. Verify trackis perpendicular to base.
4. Weld plates on base to roller trackas shown in
Figure 5
.
5. Remove bolts used in Step 3.
Install
DOK-LOK
vehicle restraint onto dockface at specified
location by welding to an embedded steel plate or by using the
eight (8) concrete anchors provided in conjunction with welding
to pit steel and a leveler frame. Refer to
Figure 6
.
For site specific installation refer to
RITE-HITE
Application
information provided with
DOK-LOK
vehicle restraint. When in
doubt, call
RITE-HITE
Representative or
RITE-HITE
Customer Service at [phone].
NOTE
: Some mechanical docklevelers have an adjusting
nut access hole in the leveler front subframe. If the
VBR-300
DOK-LOK
vehicle restraint roller track
interferes with the access hole, the trackplate must
be cut to allow access. Refer to
Figure 9, page 9
.
NOTE
: Some levelers may be slightly recessed within pit. A
shim must be inserted between the roller trackplate
and the leveler front subframe and then must be
welded in place. Refer to
Figure 10, page 9
for
adding a necessary lip guide.
Anchor Installation Instructions
1. Put
DOK-LOK
vehicle restraint in place.
2. Drill hole of 5/8"diameter and minimum of 4-5/8"deep.
Clean out hole.
3. Insert anchor and drive flush with roller trackplate,
making certain that the threaded wedge is put in first. Do
not disassemble anchor prior to installation.
4. Install all anchors and torque to 100 ft-lbs.
WeldingInstallation Instructions
If the installation being worked on is a “reinstallation” the
following electrical connections must be disconnected prior to
welding. MakesuretoLOCKOUT/TAGOUT the power at the
fused disconnect, then remove sensing switch connections
from control box. Once all welding procedures have been
completed, reconnect all wires.
Figure 5
:WeldPlatesonBasetoRollerTrack
•Aplumb roller track plateisrequired. If thedock face
is notplumb/perpendicular,contact your
RITE-HITE
representativeor RITE-HITE at(800) 456-0600.
•Thecarriage roller track cannotbebentor deformed.
Straighten or replaceasrequired.
IMPORTANT
Eight (8) concreteanchors are provided with each
VBR-300
DOK-LOK vehicle restraint.You mustinstall
an anchor in each roller track platehole except those
plug-welded toembedded steel
Figure 6
: Anchoring Roller TrackPlate
Never weld on theVBR-300 DOK-LOK vehicle
restraintafter sensingswitches are wired intothe
control boxand thepower totheboxis on. Electrical
currentfromtheweldercan “feedback”through the
circuitand damagethemotor and other components.
IMPORTANT
IMPORTANT

RITE-HITE VBR-300 DOK-LOK Owner’sManual
9
NOTE 1
:
Figure 7
– Plug weld all holes that are in contact
with embedded mounting plate. All eight (8) holes
must be either plug welded or anchored.
NOTE 2
:
Figure 7
– Shims must be the full length of the
roller trackmounting plate. Minimum electrode
must be 1/8"7018 or better.
NOTE 3
:
Figure 7
–Neverinstall
DOK-LOK
vehicle
restraint directly onto concrete blockor brickdock
face.
NOTE 4
:
Figure 7
– When welding
DOK-LOK
vehicle
restraint, disconnect power and ground leads to
DOK-LOK
vehicle restraint and leveler.
NOTE 5
:
Figure 7
– Due to actual conditions, total mounting
height may be different. Refer to
RITE-HITE
Application Guidelines
for actual mounting height.
Special Application Installation
NOTE 1
:
Figure 10
–Shimasrequired behind trackangles
(1/2” thickminimum bar stock) and weld in place.
Figure 7
: Welding Roller Track-Front View
Figure 8
: Welding Roller Track-Side View
Figure 9
:RollerTrack,FrontView
Figure 10
:RollerTrack, Side View
Add length tolipguide as required (supplied by
others).Weld in placeasshown in
Figure 10
.Do not
weld toleveler frontframeangle.
IMPORTANT

10
RITE-HITE VBR-300 DOK-LOK Owner’sManual
Install HydraulicComponents
1. Mount hydraulic power unit on dockwall as shown in
Figure 3, page 7
using supplied mounting bracket
(hardware supplied by others). Power unit must be
mounted on side shown and within 24” of control box.If
control boxis mounted on the other side of the dockpit,
ajunction boxwill be required. Wiring from the power
unit to control boxwill be routed over the dockdoorway.
2. Drill two holes through dockwall for hydraulic hoses to
pass through. Make sure holes are free of debris or
sharp edges prior to passing hoses through wall.
Conduit may be required in some applications to protect
hoses.
3. Route hoses from
DOK-LOK
vehicle restraint, through
dockwall and connect to hydraulic power unit.
4. Secure hoses to dockface to prevent possible damage.
Any extra hosing should be coiled and secured to the
inside dockwall below the power unit.
Install Electrical Components
DOK-LOK Power Source
If the incoming electrical power for the VBR-300
DOK-LOK
vehicle restraint is taken from a nearby electrical appliance,
i.e., overhead door opener, verify that the amperage is in
accordance with local and federal codes.
The
DOK-LOK
vehicle restraint vehicle restraint requires 120V,
single phase power, 60 Hz power and 10 amps of current, for
the 1/3 HP hydraulic power unit, to operate properly. Two (2)
DOK-LOK
vehicle restraints can be hooked into one (1) 20
amp branch circuit breaker per the 1999 National Electrical
Code Paragraph 430-53.
When in doubt, call your
RITE-HITE
representative or
RITE-HITE
at [phone].
The
DOK-LOK
vehicle restraint assembly includes a hydraulic
power unit. Also provided are the control boxwith lights and the
outside signal light box. The outside junction box, conduit
fittings and wire are provided by others. Quality material and
workmanship should be used. Refer to
Figure 12, page 11
for
component location information. Refer to
Figure 13, page 12
and
Figure 14, page 13
for wiring information.
Fill and Bleed HydraulicSystem
1. Fill reservoir using supplied (MIL-H-5606) hydraulic
fluid.
2. Press and hold service button (refer to
Figure 14,
page 13
) inside control boxuntil horn chirps. Controls
are now in FILL mode. Holding the LOCK or UNLOCK
button will run the pump up or down.
3. Cycle the
DOK-LOK
vehicle restraint up and down to
remove air from the system. Add remaining hydraulic
fluid. Stop cycling once the barrier travels the full length
of the trackwithout hesitation.
4. Press service button inside control boxto exit FILL
mode.
Figure 11
: Installing Hydraulic Components
When workingwith electrical or electroniccontrols,
makesurethatthepower sourcehas been locked out
and tagged accordingto
OSHA regulations and
approved local electrical codes.
All componentsmustbeconnected toaSAFETY
EARTH GROUNDwhere indicated. TheSAFETY
EARTH GROUNDmustconformtothe1999 National
ElectricCode Section 250-50section (a)or section (c)
for a groundingelectrode system.
DANGER
IMPORTANT

RITE-HITE VBR-300 DOK-LOK Owner’sManual
11
Install Signs
There are two (2) driver warning signs and one (1) inside
operator sign supplied with each
DOK-LOK
vehicle restraint.
Because of the many ways signs can be mounted, hardware is
not supplied. Mount both outside signs on the right hand side
of the
DOK-LOK
vehicle restraint. The mirror-image sign is
usually mounted above the lower sign and near the outside
signal lights. (Mirror-image permits the truckdriver to read sign
from truckmirror.) Mount the inside sign nexttothecontrolbox.
All signs must be installed.
NOTE 1
:
Figure 12
– Some docks may have dock/truck
seals (or shelters) installed or planned which are
larger than standard. Outside light, sign location,
and mounting should be studied before
proceeding to avoid interference.
NOTE 2
:
Figure 12
–Ifrequired for special reasons, signs
may be trimmed for fit. NEVER cut or eliminate
sign letters/words.
NOTE 3
:
Figure 12
– Attach signs with concrete anchors or
screws. Nails are not acceptable.
NOTE 4
:
Figure 12
– NEVER put conduit in front of signs. A
clear view of both exterior signs and the single
interior sign must be maintained at all times.
NOTE 5
:
Figure 12
– Secure R.I.G. sensor wire to wall.
Make sure wire is secured so barrier can travel the
full length of the track.
OperatingTest
Follow
Operating Procedure, page 15
.
Figure 12
: Suggested Component Location
See NOTE 1
See NOTE 2
See NOTE 3
See NOTE 4
See NOTE 5

12
RITE-HITE VBR-300 DOK-LOK Owner’sManual
WiringDiagram
NOTE 1
:
Figure 13
–Allwiretobe#14 gauge. All conduit
and fittings to be 3/4” or per local code.
NOTE 2
:
Figure 13
– Refer to
Figure 12, page 11
for
sensing switch wire routing.
NOTE 3
:
Figure 13
–ACmotor rating 1/3 HP, 120V, 1PH,60
Hz,5.2A,(F.L.A.) reversible, intermittent duty.
NOTE 4
:
Figure 13
– If outside lights do not work,check
connections of wires #40, 41 and 42.
Figure 13
: Installation Wiring Diagram

RITE-HITE VBR-300 DOK-LOK Owner’sManual
13
Electrical Schematic(Standard)
Figure 14
: Electrical Schematic (Standard)

14
RITE-HITE VBR-300 DOK-LOK Owner’sManual
Electrical Schematic(Optional)
Figure 15
: Electrical Schematic (Optional)

RITE-HITE VBR-300 DOK-LOK Owner’sManual
15
OperatingProcedure
STORED
Barrier is in the STORED position. Inside light is flashing red
alerting forklift operator unsafe condition exists. Outside light is
flashing green alerting truckdriver it is safe to backin.
•Before loadingor unloadingavehicle atyour loading
dock while usinga
DOK-LOK vehicle restraint, always
visuallyinspect tobesurethatthebarrier blocksthe
R.I.G. assembly.If acondition occurs thatcannotbe
remedied by backingthetrailer firmlyagainstthe dock
bumpers,secure thetrailer by other means.
•Besurethatthe area around theR.I.G. assemblyis
free ofplates or other obstructions.
•Alwaysoperatethe
DOK-LOK vehicle restraintfrom
thetopofthe dock.
•Inspect all restraintlightsandhorns dailytomake
certain theyworkproperly.
•Performmaintenanceonrestraintsinaccordancewith
Maintenance on page 19
ofthis manual.
•
DOK-LOK vehicle restraintsshould beoperated only
by authorized personnel whohave read and
understand the Owner’s Manual.
•Call
RITE-HITE at(800) 456-0600 with anyquestions.
FAIL URE TOFOLLOWTHESEPROCEDURESCOULD
ALLOWUNEXPECTED TRAILER/LOADINGDOCK
SEPARATION RESULTINGINDEATH ORSERIOUS
INJURY!
WARNING
Figure 16
: STORED Position

16
RITE-HITE VBR-300 DOK-LOK Owner’sManual
RestraintLocking, LOCK Button Pressed
Trailer has backed into loading dockand is parked firmly
against dockbumpers. Barrier raises from STORED position to
obstruct R.I.G. Inside light is steady red alerting the operator
that an unsafe condition exists and barrier is in transit. Outside
light is flashing red alerting truckdriver not to move.
If horn sounds, go to FAULT state, otherwise go to Restraint
LOCKED.
RestraintLOCKED
Once the R.I.G. is obstructed by the barrier, a LOCKED
condition exists. Inside light is flashing green alerting the forklift
operator a safe condition exists. Outside light is flashing red
alerting truckdriver not to move.
If during loading/unloading the inside light turns red and the
horn sounds, press LOCK button to secure the R.I.G.
Figure 17
: Restraint Locking
Visually inspect to ensure that the
DOK-LOK
barrier
obstructs the R.I.G. of the trailer being serviced before
operating the dockleveler.
WARNING
Figure 18
: Restraint LOCKED

RITE-HITE VBR-300 DOK-LOK Owner’sManual
17
RestraintUNLOCKING, UNLOCK Button Pressed
Barrier travels from the LOCKED position to the STORED
position. Inside light is steady red alerting the operator that an
unsafe condition exists and hookis in transit. Outside light is
flashing red alerting truckdriver not to move. If horn sounds go
to FAULT state, otherwise go to STORED.
FAULT StateFromLOCKINGState
Barrier cannot obstruct the R.I.G. This could be due to a R.I.G.
that is located too far toward the rear axle, bent, obstructed or
missing. Inside light is flashing red and horn is pulsing, alerting
the forklift operator that the trailer is not locked. Outside light is
flashing red alerting the truckdriver not to move.
If the trailer is parked firmly against the dockbumpers go to
HORN OVERRIDE state. If not, press UNLOCK to clear the
fault, have trailer backup and repeat Restraint LOCKING.
FAULT StateFromUNLOCKINGState
Barrier cannot retract to the STORED position. The barrier
could be caught on the R.I.G. or another part of the trailer.
Inside light is flashing red and horn is pulsing, alerting the
forklift operator that the trailer is not locked. Outside light is
flashing red alerting the truckdriver not to move.
Make sure trailer is parked firmly against the dockbumpers. If
not, press LOCK to entrap R.I.G., have trailer backup and
repeat Restraint UNLOCKING.
Figure 19
: Restraint Unlocking
Figure 20
:FAULT State

18
RITE-HITE VBR-300 DOK-LOK Owner’sManual
HORNOVERRIDE State,HORNOVERRIDE
Button Pressed after SecuringTrailer by
AlternateMeans
An alternate means of securing the truckmust be used (i.e.
wheel chocks). Inside lights are flashing red and green
alerting the forklift operator the trailer is secured by other
means. Outside light is flashing red alerting the truckdriver
not to move.
To return to STORED, press the HORN OVERRIDE button
followed by the UNLOCK button.
Figure 21
:HORN OVERRIDE State

RITE-HITE VBR-300 DOK-LOK Owner’sManual
19
Maintenance
NOTE
: If a leveler is installed at the VBR-300
DOK-LOK
vehicle restraint location, it may be necessary to raise
the leveler before removing the barrier assembly from
the roller track. Use care when removing barrier
assembly from roller trackto not pull wire out of wall
mounted junction box. Raise the leveler, insert and
secure the
SAFE-T-STRUT
, and LOCKOUT/
TAGOUT the power source.
Daily
1. Remove debris around VBR-300
DOK-LOK
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 dockbumpers. Missing bumpers must be
replaced.
180Days
1. Perform all
Daily
maintenance.
2. Grease rollers at fitting located on the barrier. Use
Mobilith
SHC220 No. 2 grease (or equivalent
temperature range lithium based grease). Seven (7) to
eight (8) pumps should be used for first 180 Day
maintenance. Two (2) to three (3) pumps at subsequent
180 Day maintenance intervals.
3. Inspect hydraulic hoses and power unit for signs of
leakage. Checkoil fluid level.
4. Inspect outside junction and light box. They should be
rigidly mounted. If loose or damaged, inspect all wires
and wire connections.
5. Checkthat all concrete anchor bolts are torqued to 100
ft-lbs.
6. Inspect switch wires from VBR-300
DOK-LOK
vehicle
restraint to junction box.Lookfor kinks, crushed areas,
etc.
7. Perform operational test after all maintenance repairs
and adjustments are complete.
8. Inspect dockbumpers. Four inches (4")ofprotectionis
required. Worn, torn, loose or missing bumpers must be
replaced.
When workingwith electrical or electroniccontrols,
makesurethatthepower sourcehas been locked out
and tagged accordingto
OSHA regulations and
approved local electrical codes.
Postsafety warningsandbarricade workarea,at
dock level and atground level,toprevent
unauthorized use ofthe dock position.
Asafeworkplacerequires all lightsandthehorn to
beworkingproperly.DONOTuse
DOK-LOK vehicle
restraintifpartsarebroken or missing.
Maintenance may be requiredmorefrequently at loading
docksexposed to harsh environments (extreme climates,
corrosive chemicals, frequency of usage, etc.). Consult
RITE-HITE
if these conditions exist for accelerated
maintenance requirements.
DANGER
DANGER
WARNING
IMPORTANT
Figure 22
: Maintenance and Lubrication

20
RITE-HITE VBR-300 DOK-LOK Owner’sManual
Troubleshooting
General DiagnosticInformation
ProblemProbable Cause Solution
1
DOK-LOK
barrier does not raise and
lights do not flash.
Power source malfunction. Checkpower source including building
circuit breaker, 1A fuse and 5A fuse on
power module.
Power module failure. Verify the appropriate motor output LED is
lit when the LOCK button or UNLOCK
button is pressed.
Incorrect wiring. Verify wiring per
Electrical Schematic
(Standard)
,
Figure 14, page 13 and
Electrical Schematic (Optional),Figure 15,
page 14
.
2
DOK-LOK
lights are flashing, but
barrier does not raise/lower, to full
extent.
Blown fuse. Check5A fuse on power module. Replace
as required.
Low incoming voltage. Verify incoming voltage at L1andL2isa
minimum of 110V. Do not power off a
control transformer from other equipment
unless properly sized for load.
Power module failure. Verify the appropriate LED is lit when the
LOCK button or UNLOCK button is
pressed.
No push button inputs. Checkfor defective push button board or
ribbon cable.
Hydraulic power unit defective. Checkhydraulic power unit,
Figure 23,
page 21
. Repair or replace as required.
Leakin hydraulic circuit. Checkall hydraulic hose and fittings for
leaks. Inspect lift cylinder for excessive oil.
Debris in roller track/base. Clean debris from roller trackand base.
Incorrect wiring. Verify wiring per
Electrical Schematic
(Standard)
,
Figure 14, page 13 and
Electrical Schematic (Optional),Figure 15,
page 14
.
3
DOK-LOK
vehicle restraint is
operational but barrier drops causing
lights to change and/or horn to sound
while trailer is being serviced.
Leakin hydraulic circuit. Checkall hydraulic hose and fittings for
leaks. Inspect lift cylinder for excessive oil.
Air in hydraulic system. Cycle barrier up and down to purge
hydraulic system of excess air.
4
DOK-LOK
barrier is operational but all
lights are out.
Bulbs burnt out, loose or missing. Checkall bulbs and replace as required.
Damaged CPU module. If the ISGand OSR LEDs are not flashing
whileintheLOCKED position or the ISR
and OSGLEDs are not flashing while in
the UNLOCKED position, replace the CPU
module as required.
Incorrect wiring. Verify wiring per
Electrical Schematic
(Standard)
,
Figure 14, page 13 and
Electrical Schematic (Optional),Figure 15,
page 14
.