Maxon GPT-4 User Manual
OPERATION MANUAL
GPT-25, GPT-3, GPT-4 & GPT-5
M-06-09
REV. B
APRIL 2008
© MAXON Lift Corp. 2008
TABLE OF CONTENTS
WARNINGS ............................................................................... 4
LIFTGATE TERMINOLOGY ...................................................... 5
RECOMMENDED DAILY OPERATION CHECKS .................... 6
DECALS .................................................................................... 8
FORKLIFT ADVISORY .............................................................. 11
OPERATION ............................................................................. 12
USING CART STOPS (IF EQUIPPED) ..................................... 19
WARNING
!
1. Incorrect operation of this Liftgate can result in serious personal
injury. Comply with WARNINGS and Liftgate operating instructions
in this manual. Do not allow untrained persons to operate the
Liftgate. If you need to replace an Operation Manual, additional
copies are available from:
MAXON Lift Corp.
11921 Slauson Ave
Santa Fe Springs, CA 90670
(800) 227-4116
NOTE: For latest version manuals (and replacements), down-
load manuals from Maxon’s website at www.maxonlift.com.
2. Do not exceed rated load capacity of the Liftgates which is 2500 lbs.
for the GPT-25, 3000 lbs. for the GPT-3, 4000 lbs. for the GPT44, and 5000 lbs. for the GPT-5.
3. Do not allow any part of your body to be placed under, within, or
around any portion of the moving Liftgate or its mechanisms, or in
a position that would trap them between the platform and the fl oor
of truck body (or between platform and the ground) when Liftgate is
operated.
4. Consider the safety and location of bystanders and
location of nearby objects when operating the Liftgate. Stand
to one side of platform while operating the Liftgate. Be certain
that the area the Liftgate will move through during operation
is clear of all obstacles.
5. Comply with all attached instruction decals and warning decals.
6. Keep decals clean and legible. If decals are defaced or missing
have them replaced. Get free replacement decals from Maxon.
7. Never drive a forklift on the Liftgate Platform.
8. Do not move vehicle unless Liftgate is correctly stowed.
9. Correctly stow platform when not in use. Extended platforms
could create a hazard for people and vehicles passing by.
10. A correctly installed Liftgate will operate smoothly and reasonably
quiet. The only noticeable noise, during Liftgate operation, is from
the power unit while the platform is raised. Listen for scraping,
grating and binding noises and have the problem corrected
before continuing to operate the Liftgate.
11. Above all, USE GOOD COMMON SENSE when operating this
Liftgate.
12. Never use a cell phone while operating the Liftgate.
4
LIFTGATE TERMINOLOGY
EXTENSION
PLATE
DOCK
BUMPER
LIFT
CYLINDER
PARALLEL
ARM
PLATFORM
WEDGE FLIPOVER
SADDLE
PUMP BOX
CONTROL
SWITCH
TORSION
SPRING
PLATFORM
OPENER
MAIN
FRAME
LIFT
ARM
5
RECOMMENDED DAILY OPERATION CHECKS
NOTE: Before you check the Liftgate, park vehicle on fl at ground and
set the parking brake.
NOTE: If any of the following operation checks reveal a need to service
or repair Liftgate, do not operate the Liftgate until a qualifi ed
mechanic services or repairs the Liftgate.
Before operating the Liftgate, the operator should do the following:
Make sure vehicle battery is fully charged and battery terminal connec-
tions are clean and tight.
Visually check that pump cover is latched closed securely and undam-
aged. Look for hydraulic fl uid leaking from the pump box.
Visually check that control switch is in place and undamaged
Visually check for cracks and bends on the extension plate. Also, make
sure fasteners are in place and undamaged and extension plate is
clean (no oil, debris, or corrosion).
Visually check that all decals are in place (see DECAL pages). Also
make sure decals are clean, readable, and undamaged.
Use the operation instructions in this manual to lower the Liftgate to
the ground and open the platform and fl ipover.
Check main frame, lift arms, parallel arms and platform openers for
cracks and bends. Make sure rollers, on the platform openers, roll
freely. Also, make sure all bolts, nuts, and pins are in place and undamaged.
Make sure main frame, lift arms, parallel arms and platform openers
are clean (no oil, debris, or corrosion).
Check the hydraulic cylinders for leaking seals and hose connections.
Follow the hydraulic hoses (or return lines for gravity down Liftgates)
from the cylinders to pump box. Make sure all hoses are connected at
both ends and there are no cracks, chafi ng, and fl uid leaks.
6
With the platform unfolded
and raised to bed level,
check if the outboard
edge of platform is level
or rises up to 2” above
bed level (YES illustra-
tion). If the outboard
edge of platform looks
like the YES illustration,
you can operate Liftgate.
If the outboard edge of
platform is below level
line and platform looks
like the NO illustra-
tion, do not operate the
Liftgate. (See NOTE at
beginning of the DAILY
OPERATION CHECKS.)
YES
OUTBOARD EDGE
0” (LEVEL) - 2” MAX.
LEVEL LINE
NO
LEVEL LINE
EXTENSION
PLATE (REF)
EXTENSION
PLATE (REF)
VEHICLE
FLOOR (REF)
VEHICLE
FLOOR (REF)
Check the platform and fl ipover for cracks, holes, and bends on the
load-carrying surface and side plates. Also, make sure torsion bars,
coil springs, and fasteners are in place and undamaged.
Make sure platform and fl ipover load-carrying surfaces are clean (no
oil, debris, or corrosion).
Use the operation instructions in this manual to operate the Liftgate
through one cycle without a load on the platform. RAISE the platform
to vehicle bed height. Next, lower the platform to ground level.
When the Liftgate is moving, listen for unusual noises and look for jerk-
ing motion or uneven movement on either side of the platform.
If service or repairs are not required (or if completed), stow the Liftgate.
7
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