Maxon GPTWR-25 Operating and maintenance instructions

M-17-06
JULY 2017
© MAXON Lift Corp. 2017
To find maintenance & parts information for your GPTWR Liftgate,
go to www.maxonlift.com. Click the PRODUCTS, TUK-A-WAY &
GPTWR buttons. Open the Maintenance Manual in the PRODUCT
DOCUMENTATION window. For parts, click on the PARTS PORTAL,
TUK-A-WAY & GPTWR buttons.

TABLE OF CONTENTS
SUMMARY OF CHANGES: M-17-06 ................................................................................... 4
WARNINGS........................................................................................................................... 5
SAFETY INSTRUCTIONS .................................................................................................... 6
NOTICE................................................................................................................................. 6
STANDARD LIFTGATE COMPONENTS .............................................................................. 7
GPTWR INSTALLATION PARTS BOX.................................................................................. 8
GPTWR-SERIES MANUALS & DECALS.............................................................................. 9
VEHICLE REQUIREMENTS............................................................................................... 10
CENTER OF MASS............................................................................................................. 13
STEP 1 - ATTACH EXTENSION PLATE TO VEHICLE ....................................................... 15
BOLT EXTENSION PLATE .................................................................................. 15
WELD EXTENSION PLATE (ALTERNATE METHOD) ........................................ 18
STEP 2 - WELD LIFTGATE TO VEHICLE .......................................................................... 20
STEP 3 - ATTACH OPTIONAL BATTERY BOX & FRAME TO VEHICLE (IF EQUIPPED). 24
STEP 4 - RUN POWER CABLE.......................................................................................... 32
STEP 5 - CONNECT POWER CABLE................................................................................ 34
STEP 6 - CONNECT GROUND CABLE (RECOMMENDED) ............................................. 36
STEP 7 - INSTALL CONTROL SWITCH ............................................................................. 37
STEP 8 - CHECKING HYDRAULIC FLUID......................................................................... 39
STEP 9 - CONNECT POWER CABLE TO BATTERY......................................................... 41
STEP 10 - REMOVE LOCKING ANGLES & KNUCKLE BOLTS, CHECK FOR
INTERFERENCE................................................................................................................. 42
STEP 11 - INSTALL OPENER & LICENSE PLATE BRACKET WITH
ICC BUMPER OR UNDERRIDE ......................................................................................... 47
INSTALLATION WITH ICC BUMPER ................................................................ 47
INSTALLATION WITH UNDERRIDE ................................................................. 49
STEP 12 - ADJUST PLATFORM (IF REQUIRED) .............................................................. 51
STEP 13 - FINISH WELDING LIFTGATE TO VEHICLE ..................................................... 53
STEP 14 - BOLT STEPS TO EXTENSION PLATE ............................................................ 54
STEP 15 - ADJUST WALK RAMP PADS ............................................................................ 58
STEP 16 - LUBE GREASE FITTINGS AS NEEDED........................................................... 59

APPLY DECALS................................................................................................................. 60
DECALS & PLATES ........................................................................................................... 62
TOUCH-UP PAINTED OR GALVANIZED FINISH.............................................................. 63
SYSTEM DIAGRAMS......................................................................................................... 64
PUMP & MOTOR SOLENOID OPERATION ....................................................................... 64
HYDRAULIC SCHEMATIC (POWER DOWN) .................................................................... 65
ELECTRICAL SCHEMATIC (POWER DOWN) ................................................................... 66
GPTWR ELECTRICAL VALUES ......................................................................................... 67
OPTIONS ............................................................................................................................ 68
OPTIONAL LIFTGATE COMPONENTS.............................................................................. 68

SUMMARY OF CHANGES: M-17-06
PAGE DESCRIPTION OF CHANGE
5 Changed WARNING for welding galvanized steel to reference AWS D19.0.
7 Main assembly shows new bolt-on mounting plates.
8
Added Installation Parts Box Tables A, B & C. Added new molded, toggle switch
assembly, Added new 1/2” X 5/16” flat washer, 1-1/2” long self-tapping screws for
control switch assembly, and 1/2” long self-tapping screws for rubber loom clamp.
Added ground cable assembly, 2 GA X 48’ LG.
9 Updated GPTWR series manuals and decals part numbers.
17 Added welding note and specifications for bolt-on extension plate.
18
Removed WARNING for welding galvanized parts. Added note for recommended
practices for welding galvanized steel to refer to AWS (American Welding Soci-
ety) D19.0 Welding Zinc-Coated Steel.
20 Added illustration and table showing mounting plates for various frame widths.
20-23
Updated Step 2: Weld Liftgate to Vehicle instructions. Bolt-on mounting plates
are not welded to main frame. With bolt-on mounting plates, it’s not necessary to
remove split loom.
23 Added electrical welder Caution for connecting welder.
27 Removed instruction and image regarding welding galvanized decal.
34, 35, 38,
65
Updated power unit has no thermal switch. Fused power connection shows new 10
AMP fuse holder assembly.
36 Added new instructions to connect ground cable supplied with parts Box B.
38 Updated hydraulic fluid reservoir fill level.
40, 47, 49,
10, 55
Added instructions for disconnecting and reconnecting both negative (-) and posi-
tive (+) battery connections.
47-50 Made separate procedures for GPT’s equipped with ICC bumper or underride.
55 Added 1/2”-13 flange lock nuts for mounting steps to extension plate.
62 Removed galvanized warning decal.
63 Updated Platform Warning Decal, P/N 281189-02
66 Updated electrical schematic show cycle counter (if equipped).
67 Added GPTWR electical values.
68, 69
Updated hand-held, street side and dual control kits in the OPTIONS table. Re-
moved cold galvanize spray (16 OZ) and bright zinc spray paint (16 OZ). Removed
painted step kit options.

11921 Slauson Ave. Santa Fe Springs, CA. 90670 [phone] FAX [phone]
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•Do not stand, or allow obstructions, under the platform when lowering the Liftgate. Be sure your
feet are clear of the Liftgate.
• Keep fingers, hands, arms, legs, and feet clear of moving Liftgate parts (and platform
edges) when operating the Liftgate.
•Make sure vehicle battery power is disconnected while installing Liftgate. Connect vehicle
battery power to the Liftgate only when installation is complete or as required in the installation
instructions.
Comply with the following WARNINGS and SAFETY INSTRUCTIONS while installing
Liftgates. See Operation Manual for operating safety requirements.
•If it is necessary to stand on the platform while operating the Liftgate, keep your feet and any
objects clear of the inboard edge of the platform. Your feet or objects on the platform can become
trapped between the platform and the Liftgate extension plate.
•Never perform unauthorized modifications on the Liftgate. Modifications may result in early failure
of the Liftgate and may create hazards for Liftgate operators and maintainers.
• Correctly stow platform when not in use. Extended platforms could create a hazard for
people and vehicles passing by.
WARNING
•Recommended practices for welding on steel parts are contained in the current AWS (American
Welding Society) D1.1 Structural Welding Code - Steel. Damage to Liftgate and/or vehicle, and
personal injury can result from welds that are done incorrectly.
!
WARNINGS
•Recommended practices for welding galvanized steel are contained in the current AWS (Ameri-
can Welding Society) D19.0 Welding Zinc-Coated Steel. Damage to Liftgate and/or vehicle, and
personal injury can result from welds that are done incorrectly.

11921 Slauson Ave. Santa Fe Springs, CA. 90670 [phone] FAX [phone]
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NOTICE NOTICE
•Maxon Lift is responsible for the instructions to correctly install MAXON Liftgates on
trucks or trailers only.
•Liftgate installers, not Maxon Lift, are responsible for reviewing and complying with all
applicable Federal, State, and Local regulations pertaining to the trailer or truck.
SAFETY INSTRUCTIONS
SAFETY INSTRUCTIONS
•Comply with all WARNING and instruction decals attached to the Liftgate.
•Keep decals clean and legible. If decals are illegible or missing, replace them. Free replacement
decals are available from Maxon Customer Service.
•Consider the safety and location of bystanders and location of nearby objects when operating the
Liftgate. Stand to one side of the platform while operating the Liftgate.
•Wear appropriate safety equipment such as protective eyeglasses, faceshield and clothing while
performing maintenance on the Liftgate and handling the battery. Debris from drilling and contact
with battery acid may injure unprotected eyes and skin.
•Do not allow untrained persons to operate the Liftgate.
•Be careful working by an automotive type battery. Make sure the work area is well ventilated and
there are no flames or sparks near the battery. Never lay objects on the battery that can short the
terminals together. If battery acid gets in your eyes, immediately seek first aid. If acid gets on your
skin, immediately wash it off with soap and water.
•If an emergency situation arises (vehicle or Liftgate) while operating the Liftgate, release the con-
trol switch to stop the Liftgate.
•Read and understand the instructions in this Installation Manual before installing Liftgate.
•Before operating the Liftgate, read and understand the operating instructions in Operation
Manual.
•A correctly installed Liftgate operates smoothly and reasonably quiet. The only noticeable noise
during operation comes from the power unit while the platform is raised and lowered. Listen for
scraping, grating and binding noises and correct the problem before continuing to operate Liftgate.
•Installers of the liftgate should ensure that all trucks and trailers are equipped with grab
handles as needed. Refer to Technology Maintenance Council (TMC) RP 1428: Entry
And Egress Guidelines for Vehicles With Fold-Under Type Liftgates.

11921 Slauson Ave. Santa Fe Springs, CA. 90670 [phone] FAX [phone]
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STANDARD LIFTGATE COMPONENTS
CAUTION
!
NOTE: Make sure you have all components and parts before you start installing Liftgate.
Compare parts in the part box and each kit box with packing list enclosed in each
box. If parts and components are missing or incorrect, call:
Maxon Customer Service
Call [phone] or
Send e-mail to [email protected]
Unpacking the Liftgate on unlevel surface may allow heavy components to slide off
when shipping bands are cut. Injury and equipment damage could result. Before
the shipping bands are cut, put Liftgate on level surface that will support 1500 lbs.
When unpacking the Liftgate, remove heavy components carefully to avoid injury
and damage.
EXTENSION PLATE
MAIN
ASSEMBLY
PARTS
BOXES
OPENER
STEP KIT
ASSEMBLY
(DUAL STEPS
SHOWN)
TYPICAL LIFTGATE COMPONENTS FOR SHIPMENT
(OPTIONAL COMPONENTS NOT SHOWN)
FIG. 7-1

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GPTWR INSTALLATION PARTS BOX
PARTS BOX A WITH POWER CABLE
TABLE 8-1
PARTS BOX C WITH GROUND CABLE
TABLE 8-3
PARTS BOX B WITHOUT POWER CABLE, GROUND CABLE, OR FRAME CLIPS
TABLE 8-2
ITEM NOMENCLATURE OR DESCRIPTION QTY. PART NUMBER
REF PARTS BOX A 1 297502-01
1SPRING CLIP, 1/2” x 1-3/8” 10 050079
2PLASTIC TIE 2 206864
3#10 RUBBER LOOM CLAMP 2 801681
4CABLE ASSEMBLY, 175 AMPS, 38 FT LG. 1 264422
5SELF-TAPPING SCREW, 10 X 1/2” LG. 2 030458
6GROUND CABLE ASSEMBLY, 2 GA X 48” LG. 1 251871-26
ITEM NOMENCLATURE OR DESCRIPTION QTY. PART NUMBER
REF PARTS BOX C 1 297502-02
1SPRING CLIP 20 050079
2PLASTIC TIE 4 206864
3GROMMET, 1” DIA, 2 HOLES 1 266428-09
4CABLE ASSY, 175 AMP 38 FT LG 1 264422
5GROUND CABLE ASSY, 2 GA X 38FT LG 1 269191-01
6#10 LOOM CLAMP 2 801681
7SELF-TAPPING SCREW, 10 X 1/2” LG. 2 030458
ITEM NOMENCLATURE OR DESCRIPTION QTY. PART NUMBER
REF PARTS BOX B 1 297049-02
1SHIM, 2-1/2” X 1” X 16 GAUGE 2 264732
2TOGGLE SWITCH ASSEMBLY 1 296855-01
3FLAT WASHER, 1/2” X 5/16” THICK 2 902000-13
4HEX NUT, 1/2”-13 2 901011-9
5CAP SCREW, 1/2’’-13 X 1-1/2” LG. 2 900035-3
6INSTALLATION BRACKET 2 269462-01
7LUG, 2 GAUGE, COPPER, 5/16” 1 906497-02
8SCREW, SELF TAPPING, #10-24 X 1-1/2” LG 2 900057-7
9HEAT SHRINK TUBING, 3/4” X 1-1/12” LG. 1 253316-04
10 FLAT, 2-1/2” X 1” X 1/8” THICK 2 201999
11 LICENSE PLATE BRACKET KIT 1 287015-01

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GPTWR-SERIES MANUALS & DECALS
ITEM NOMENCLATURE OR DESCRIPTION QTY. PART NUMBER
REF DECAL & MANUAL KIT 1
297225-11 (GPTWR-25)
297225-12 (GPTWR-3)
297225-13 (GPTWR-4)
297225-14 (GPTWR-5)
1INSTALLATION MANUAL (GPTWR) 1 M-17-06
2OPERATION MANUAL (GPT & GPTWR) 1 M-17-07
3DECALS (SEE DECAL PAGES IN THIS MANUAL) 1 (ALL GPTWR’S)
TABLE 9-1
NOTE: To find maintenance information for your GPTWR Liftgate, go to www.max-
onlift.com. Click the PRODUCTS, TUK-A-WAY & GPTWR buttons. Open
the Maintenance Manual in the PRODUCT DOCUMENTATION window. For
parts, click on the PARTS PORTAL, TUK-A-WAY & GPTWR buttons.

11921 Slauson Ave. Santa Fe Springs, CA. 90670 [phone] FAX [phone]
10
VEHICLE REQUIREMENTS
1. Check for correct clearances (FIG. 10-1 & 10-2) on
vehicle to prevent interference between vehicle
and Liftgate.
NOTE: Make sure vehicle is parked on level ground while preparing vehicle and
installing Liftgate.
NOTE: BODY maximum and minimum operating bed height, for GPTWR models
with standard platform, are as follows.
Maximum height is 55” (Unloaded). Loaded height is 49”. On vehicle bodies
equipped with swing-open doors, extension plate and vehicle body must be
modified to install this Liftgate.
NOTE: Dimensions are provided as reference for fitting Liftgate to vehicle body.
GPTWR-25 & GPTWR-3 LIFTGATE CLEARANCE DIMENSIONS
FIG. 10-1
15-5/8” TO 21-5/8”
55” MAX. BED HEIGHT
49” LOADED BED HEIGHT
15”
14-3/4”
33”
29-5/8”
22”
12”
GPTWR-4 & GPTWR-5 LIFTGATE CLEARANCE DIMENSIONS
FIG. 10-2
16-3/16” TO 22-3/16”
55” MAX. BED HEIGHT
49” LOADED BED HEIGHT
15”
13-5/16”
35-5/16”
27-7/8”
12”
23-7/8”
22-3/8”
39-1/2”
22”

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WALK RAMP BOX
CLEARANCE DIMENSIONS
(FOR REFERENCE ONLY)
FIG. 11-1B
2. Check for correct clearances between walk ramp, walk ramp box, and the extension
plate (FIGS. 11-1A and 11-1B) to prevent interference.
VEHICLE REQUIREMENTS - Continued
GPTWR LIFTGATE WITH WALK RAMP BOX
FIG. 11-1A
1-1/2”
WALK RAMP PAD
(2 PLACES)
WALK RAMP
LATCH
NOTCH
(4 PLACES)
2-1/4”
25” MIN.
32-1/2” MAX.
(RAMP WIDTH)
27-1/2”
20-1/2”
2-1/4”
1-1/2”
9-3/16” 8-3/8”
EXTENSION PLATE
HSILL
HRAMP
HRAMP = 8-3/8” - HSILL - 1/8” clearance
HSILL is the height of the vehicle body sill.
HRAMP is the height of the ramp (max).

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VEHICLE FRAME CUTOUT FOR GPTWR PLATFORM CLEARANCE
(TRUCK FRAME IS SHOWN)
FIG. 12-1
22”
10”
WOODEN SPACER
BODY FLOOR
BODY CROSS-
MEMBERS
LONG SILL
TRUCK BODY
TRUCK
FRAME
3. Fit the Liftgate to vehicle body by cutting vehicle frame as shown in FIG. 12-1.
REAR SILL
PLATFORM CLEARANCE CUTOUT AREA
(WITHIN DASHED LINES)
VEHICLE REQUIREMENTS - Continued
NOTE: The platform cutout area for truck frame, shown below, is required to prevent
frame interference when platform is being stowed and unstowed. For trailers,
refer to instructions supplied with trailer mounting kit for Liftgate.
To prevent aluminum platform from being damaged, make sure vehicle frame
is cut correctly and rear sills are modified if over 4-1/8” in height. If the cutouts
are incorrect, platform may hit vehicle frame or underbody when stowing Lift-
gate. If rear sill is over 4-1/8” in height, bottom of the platform may hit the sill.
CAUTION
NOTE: Dimensions, shown in illustration below, are maximums except as indicated.
Incorrect modification of vehicle frame and/or body could contribute to serious
mechanical failure of the vehicle. Serious injury to operator, motorists, and
bystanders could result. Installer is responsible for ensuring vehicle body and
frame modification do not adversely affect the integrity of the body and frame.
If unsure about modifying vehicle, installer should consult truck/trailer body
manufacturer.
WARNING
!

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CENTER OF MASS
GPTWR-25 & GPTWR-3 CENTER OF MASS
(STOWED POSITION)
FIG. 13-2
GPTWR-25 & GPTWR-3 CENTER OF MASS
(PLATFORM AT BED HEIGHT)
FIG. 13-1
11-1/2”
CENTER OF MASS
16-1/8”
17-1/4” CENTER OF MASS
10-1/4”

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CENTER OF MASS - Continued
GPTWR-4 & GPTWR-5 CENTER OF MASS
(STOWED POSITION)
FIG. 14-2
GPTWR-4 & GPTWR-5 CENTER OF MASS
(PLATFORM AT BED HEIGHT)
FIG. 14-1
11-3/16”
CENTER OF MASS
11-3/8”
16-3/16”
CENTER OF MASS
22-3/4”

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STEP 1 - ATTACH EXTENSION PLATE TO VEHICLE
NOTE: GPTWR Liftgate extension plate comes with bolt holes so it can be
bolted to vehicle body with optional bolt kit. GRADE 8 bolts are re-
quired. MAXON recommends getting the optional extension plate
hardware kit listed in OPTIONS section. Vehicle body must be drilled
according to instructions. Extension plate may also be welded to
vehicle body. Do the following bolting or welding instructions for the
extension plate.
CAUTION
To preserve the corrosion-resistant properties of the galvanized finish,
MAXON recommends bolting the galvanized extension plate to vehicle.
CAUTION
1. Mark and drill holes into rear sill as shown in FIGS. 15-1 and 16-1.
REAR SILL - HOLE LOCATIONS FOR 96” WIDE VEHICLE
FIG. 15-1
BOLT EXTENSION PLATE
USE 9/16” DRILL
(19 PLACES)
1-1/4”
3-1/8”
REAR
SILL
1-1/2”
19”
24”
14”
34”
41”
48”
55
62”
72”
77”
82”
94-1/2”
96”
6-1/2” 6-1/2”

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REAR SILL - HOLE LOCATIONS FOR 102” WIDE VEHICLE
FIG. 16-1
STEP 1 - ATTACH EXTENSION PLATE TO VEHICLE -
Continued
1-1/4”
1-1/2”
27”
37”
44”
51”
58”
65”
75”
80”
85”
95-1/2”
100-1/2”
102”
22”
17”
REAR
SILL
USE 9/16” DRILL
(19 PLACES)
6-1/2” 6-1/2”
3-1/8”

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STEP 1 - ATTACH EXTENSION PLATE TO VEHICLE -
Continued
2. Bolt extension plate to vehicle as shown in FIG. 17-1. If necessary, reposition ex-
tension plate so top surface is flush with top surface of sill. Then, torque bolts and
lock nuts to 105 +/-20 lb-ft.
NOTE: Do not tighten extension plate bolts and lock nuts until:
• All the bolts and lock nuts are in place.
• Mating surfaces of extension plate and rear sill are made flat as possible.
• Top of extension plate is flush with top of rear sill.
CAUTION
The mating surface between the bolt-on extension plate and vehicle rear sill
must be as flat as possible. Interference between the mating surfaces could
result in a distorted top surface of extension plate when all the bolts are
tightened. Distorted extension plate can also make the dual steps difficult to
install correctly. Remove interference or shim rear sill to eliminate or reduce
the possibility of a distorted extension plate.
CAUTION
BOLTING EXTENSION PLATE (96” WIDE EXTENSION PLATE SHOWN)
FIG. 17-1
BOLTS
(KIT ITEM)
EXTENSION
PLATE VEHICLE
BODY
NOTE: An optional 102” wide extension kit is available for 102” wide vehicles. Refer to
Instruction Sheet M-09-06 supplied with kit.
IF NO CORNER POST ACCESS FOR
BOLT & NUT, WELD OUTSIDE EDGES AS SHOWN.
3/16”
WELD VERT. EDGE
IF NOT BOLTING WELD VERT. EDGE
IF NOT BOLTING 3/16”
TEARDROP
LOCK NUTS
(KIT ITEMS)
NOTE: Weld the LH and RH ends of the extension plate to vehicle body as shown
in FIG. 17-1 if any of the following conditions apply.
• Bolt holes are not accessible on the corner posts of the vehicle body.
• Liftgate will be used for dock loading applications.
• As required by body/trailer manufacturer

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EXTENSION PLATE WELDS - VIEWED FROM ABOVE
FIG. 18-1
STEP 1 - ATTACH EXTENSION PLATE TO VEHICLE -
Continued
3/16”
VEHICLE
BODY
EXTENSION
PLATE
3/16” 3/16”
WELD LENGTH & SPACE:
2”- 11 3/4” ( 96”W VEHICLE)
2”- 12 1/2” (102”W VEHICLE)
NOTE: Before welding extension plate to vehicle body, make sure:
• Inboard edge of extension plate is flush with the top of sill on vehicle body.
• Top surface of extension plate is level with the ground.
1. Center the extension plate on
vehicle body. Weld the extension
plate to vehicle body sill as shown
in FIGS. 18-1 and 19-1.
To protect the original paint system if equipped, a 3” wide area of paint must
be removed from all sides of the weld area before welding.
CAUTION
WELD EXTENSION PLATE (ALTERNATE METHOD)
To preserve the corrosion-resistant properties of the galvanized finish,
MAXON recommends bolting the galvanized extension plate to vehicle.
CAUTION

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EXTENSION
PLATE
BRACKET
(2 PLACES)
BOLTING ON INSTALLATION BRACKETS
FIG. 19-2
CAP SCREW
1/2”-13 X 1-1/2” LG.
(2 PLACES)
HEX NUT
1/2”-13
(2 PLACES)
2. Bolt 2 installation brackets (parts bag items) on the
extension plate as shown in FIG. 19-2.Tighten hex
nuts securely.
EXTENSION PLATE WELDS - VIEWED FROM UNDERNEATH
FIG. 19-1
EXTENSION
PLATE
3/16”
WELD LENGTH & SPACE:
2”- 11 3/4” ( 96”W VEHICLE)
2”- 12 1/2” (102”W VEHICLE)
VEHICLE
BODY
NOTE: During installation of liftgate, installation brackets keep the heel of the plat-
form level with extension plate and maintain a ¾” gap between extension
plate and heel of platform. The extension plate has bolt holes for bolting on
the installation brackets provided in parts box.
STEP 1 - ATTACH EXTENSION PLATE TO VEHICLE -
Continued

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STEP 2 - WELD LIFTGATE TO VEHICLE
NOTE: GPTWR Liftgates are equipped with mounting plates installed at the
factory. Mounting plate widths are shown based upon truck or trailer
frame widths. Ensure you have the correct mounting plate kit for your
application.
BOLT ON MOUNTING PLATES FOR INSTALLATION ON TRUCKS &TRAILERS
(REAR VIEW OF LIFTGATE)
FIG. 20-1
If it’s necessary to unbolt mounting plates from main frame (FIG 20-1), torque
mounting plate nuts and bolts 220-240 lb-ft (GPTWR-25/GPTWR-3) or 350-375
lb-ft (GPTWR-4/GPTWR-5).
RH
PLATE LH PLATE
“D” INSIDE
“D” OUTSIDE
BOLT &
LOCK NUT
(6 PLACES)
BOLT &
LOCK NUT
(6 PLACES)
TABLE 20-1
LIFTGATE MODEL “D” INSIDE “D” OUTSIDE APPLICATION
GPTWR-25/GPTWR-3
34-1/4” 35-1/4” Common truck chassis width
32-1/4” 33-1/4” Trailer applications
34-7/8” 35-13/16” Trailer applications (91 cm)
TABLE 20-2
LIFTGATE MODEL “D” INSIDE “D” OUTSIDE APPLICATION
GPTWR-4/GPTWR-5
34-1/4” 35-1/4” Common truck chassis width
34-7/8” 35-13/16” Trailer applications (91 cm)
39” 40” Trailer applications