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GENIE Telehandler MASTER Service Manual
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Parts Manual
GTH-844
GTH-842
GTH-644
after GTH05-12345
after GTH05-12345
after GTH05-12345
Serial Number Range
Service Manual
GTH-636
GTH-644
GTH-842
Part No. 97487
Rev D
June 2007
from GTH0806A-8418
from GTH0806B-6958
Serial Number Range
from GTH0606A-8418
from GTH0606A-8418
from GTH0606B-6271
GTH-844
GTH-1048
GTH-1056
GTH-844
from GTH1006A-8418 to
GTH-1007A-11442
from GTH0806A-8418
from GTH0806B-6956
from GTH1006A-8418 to
GTH1007A-11442

June 2007
GTH-636 • GTH-644 • GTH-842 • GTH-844 • GTH-1048 • GTH-1056 Part No. 97487 ii
Introduction
Important
Read, understand and obey the safety rules and
operating instructions in the appropriate Operator's
Manual on your machine before attempting any
maintenance or repair procedure.
This manual provides detailed scheduled
maintenance information for the machine owner
and user. It also provides troubleshooting and
repair procedures for qualified service
professionals.
Basic mechanical, hydraulic and electrical
skills are required to perform most procedures.
However ,several procedures require specialized
skills, tools, lifting equipment and a suitable
workshop. In these instances, we strongly
recommend that maintenance and repair be
performed at an authorized Genie dealer
service center.
Technical Publications
Genie Industries has endeavored to deliver the
highest degree of accuracy possible. However,
continuous improvement of our products is a Genie
policy. Therefore, product specifications are
subject to change without notice.
Readers are encouraged to notify Genie of errors
and send in suggestions for improvement. All
communications will be carefully considered for
future printings of this and all other manuals.
Contact Us:
PO Box 97030
Redmond, WA 98073-9730 USA
www.genieindustries.com
e-mail: techsup@genieind.com
Copyright © 2006 by Genie Industries
97487 Rev D June 2007
First Edition, Fourth Printing
"Genie" is a registered trademark of Genie
Industries in the USA and many other countries.
"GTH" is a trademark of Genie Industries.
Printed on recycled paper
Printed in U.S.A.
Introduction

June 2007
Part No. 97487 GTH-636 • GTH-644 • GTH-842 • GTH-844 • GTH-1048 • GTH-1056 iii
Serial Number Legend
INTRODUCTION
TH08 06 A - 1234
Model
Y ear of
manufacture
Facility code
Sequence
number
MODEL:
Genie Industries
18340 NE 76th S treet
Redmond, WA 98052
USA
GTH844
A TEREX COMPANY
SERIAL NUMBER: GTH0806A-8454
ATTACHMENT:
MANUFACTURE DATE: 02/20/06
TOTAL TRUCK WEIGHT(LBS): 22,010lbs / 9,984kg
MAX LIFT CAPACITY(LBS):
8000 LBS
LIFT CAPACITY(LBS)
AT MAX LIFT HEIGHT:
OUTRIGGERS UP:
OUTRIGGERS DOWN: N/A
N/A
6000 LBS
THIS FORKLIFT TRUCK COMPLIES
WITH:
ASME B56.6-2002 SAFETY STD FOR
ROUGH TERRAIN FORKLIFT TRUCK
Serial label
(located inside fork frame)
(models with quick attach frame)
Serial label
(located inside chassis
upright at cab side of machine)
Serial number
stamped on chassis

June 2007
GTH-636 • GTH-644 • GTH-842 • GTH-844 • GTH-1048 • GTH-1056 Part No. 97487 iv
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June 2007
Part No. 97487 GTH-636 • GTH-644 • GTH-842 • GTH-844 • GTH-1048 • GTH-1056
Safety Rules
Section 1 • Safety Rules
v
Danger
Failure to obey the instructions and safety rules
in this manual and the appropriate Operator's
Manual on your machine will result in death or
serious injury.
Many of the hazards identified in the
operator’s manual are also safety hazards
when maintenance and repair procedures
are performed.
Do Not Perform Maintenance
Unless:
You are trained and qualified to perform
maintenance on this machine.
You read, understand and obey:
- manufacturer’s instructions and safety rules
- employer’s safety rules and worksite
regulations
- applicable governmental regulations
You have the appropriate tools, lifting
equipment and a suitable workshop.

June 2007
GTH-636 • GTH-644 • GTH-842 • GTH-844 • GTH-1048 • GTH-1056 Part No. 97487
SAFETY RULES
vi
Section 1 • Safety Rules
Personal Safety
Any person working on or around a machine must
be aware of all known safety hazards. Personal
safety and the continued safe operation of the
machine should be your top priority.
Read each procedure thoroughly. This
manual and the decals on the machine,
use signal words to identify the following:
Safety alert symbol—used to alert
personnel to potential personal
injury hazards. Obey all safety
messages that follow this symbol
to avoid possible injury or death.
Indicates an imminently hazardous
situation which, if not avoided, will
result in death or serious injury.
Indicates a potentially hazardous
situation which, if not avoided,
could result in death or serious
injury.
Indicates a potentially hazardous
situation which, if not avoided,
may cause minor or moderate
injury.
Indicates a potentially hazardous
situation which, if not avoided,
may result in property damage.
Be sure to wear protective eye wear and
other protective clothing if the situation
warrants it.
Be aware of potential crushing hazards
such as moving parts, free swinging or
unsecured components when lifting or
placing loads. Always wear approved
steel-toed shoes.
Workplace Safety
Be sure to keep sparks, flames and
lighted tobacco away from flammable and
combustible materials like battery gases
and engine fuels. Always have an
approved fire extinguisher within easy
reach.
Be sure that all tools and working areas
are properly maintained and ready for
use. Keep work surfaces clean and free of
debris that could get into machine
components and cause damage.
Be sure any forklift, overhead crane or
other lifting or supporting device is fully
capable of supporting and stabilizing the
weight to be lifted. Use only chains or
straps that are in good condition and of
ample capacity.
Be sure that fasteners intended for one
time use (i.e., cotter pins and self-locking
nuts) are not reused. These components
may fail if they are used a second time.
Be sure to properly dispose of old oil or
other fluids. Use an approved container.
Please be environmentally safe.
Be sure that your workshop or work area
is properly ventilated and well lit.

June 2007
Part No. 97487 GTH-636 • GTH-644 • GTH-842 • GTH-844 • GTH-1048 • GTH-1056
Table of Contents
vii
Introduction
Important Information ......................................................................................... ii
Serial Number Legend ...................................................................................... iii
Section 1 Safety Rules
General Safety Rules ........................................................................................ v
Section 2 Rev Specifications
D Machine Specifications ................................................................................ 2 - 1
Performance Specifications ......................................................................... 2 - 3
Hydraulic Specifications ............................................................................... 2 - 4
Manifold Component Specifications ............................................................. 2 - 6
John Deere 4045TF270 Engine ................................................................... 2 - 7
John Deere 4045TF275 Engine ................................................................... 2 - 8
Deutz BF4 2012 Engine ............................................................................... 2 - 9
Perkins 1104C-44T Engine ........................................................................ 2 - 10
Perkins 1104C-44TA Engine ..................................................................... 2 - 11
Dana T12000 Transmission ....................................................................... 2 - 12
Dana T20000 Transmission ....................................................................... 2 - 12
Dana Planetary 212 Drive Axle .................................................................. 2 - 13
Dana Planetary 213 Drive Axle .................................................................. 2 - 13
Hydraulic Hose and Fitting Torque Specifications ...................................... 2 - 14
SAE and Metric Fasteners Torque Charts ................................................. 2 - 15
Section 3 Rev Scheduled Maintenance Procedures
Introduction .................................................................................................. 3 - 1
Pre-delivery Preparation Report .................................................................. 3 - 3
Maintenance Inspection Report ................................................................... 3 - 5

June 2007
GTH-636 • GTH-644 • GTH-842 • GTH-844 • GTH-1048 • GTH-1056 Part No. 97487
TABLE OF CONTENTS
viii
Section 3 Rev Scheduled Maintenance Procedures, continued
C Checklist A Procedures
A-1 Inspect the Manuals and Decals ......................................................... 3 - 7
A-2 Perform Pre-operation Inspection ....................................................... 3 - 8
A-3 Perform Function Tests ...................................................................... 3 - 8
A-4 Lubricate the Machine ........................................................................ 3 - 9
A-5 Perform Engine Maintenance - John Deere and Perkins Models ...... 3 - 11
A-6 Perform Transmission Maintenance ................................................. 3 - 11
A-7 Perform Engine Maintenance - Deutz Models .................................. 3 - 12
A-8 Perform 30 Day Service ................................................................... 3 - 12
A-9 Perform Transmission Maintenance -
GTH-636, GTH-644, GTH-842 and GTH-844 Models ...................... 3 - 13
A-10 Perform Engine Maintenance - Perkins Models ................................ 3 - 13
A-11 Perform Axle Maintenance ............................................................... 3 - 14
A-12 Perform Engine Maintenance - John Deere Models ......................... 3 - 14
A-13 Perform Transmission Maintenance -
GTH-636, GTH-644, GTH-842 and GTH-844 Models ..................... 3 -- 15
A-14 Perform Transmission Maintenance ................................................. 3 - 15
A-15 Perform Axle Maintenance ............................................................... 3 - 16
B Checklist B Procedures
B-1 Inspect the Battery ........................................................................... 3 - 17
B-2 Inspect the Electrical Wiring ............................................................. 3 - 17
B-3 Check the Exhaust System .............................................................. 3 - 18
B-4 Inspect the Engine Air Filter .............................................................. 3 - 19
B-5 Inspect the Tires, Wheels and Lug Nut Torque ................................. 3 - 19
B-6 Perform Hydraulic Oil Analysis ......................................................... 3 - 20
B-7 Inspect the Fuel and Hydraulic Tank Cap Venting Systems ............. 3 - 21
B-8 Check the Boom Wear Pads ............................................................ 3 - 22
B-9 Lubricate the Driveshafts .................................................................. 3 - 23
B-10 Perform Engine Maintenance - John Deere Models ......................... 3 - 23

June 2007
Part No. 97487 GTH-636 • GTH-644 • GTH-842 • GTH-844 • GTH-1048 • GTH-1056
TABLE OF CONTENTS
ix
Section 3 Rev Scheduled Maintenance Procedures, continued
B Checklist C Procedures
C-1 Perform Engine Maintenance - Deutz Models .................................. 3 - 24
C-2 Perform Engine Maintenance - John Deere Models ......................... 3 - 24
C-3 Perform Axle Maintenance ............................................................... 3 - 25
C-4 Perform Transmission Maintenance -
GTH-1048 and GTH-1056 Models .................................................... 3 - 25
C-5 Perform Engine Maintenance - Perkins Models ................................ 3 - 26
C-6 Perform Axle Maintenance ............................................................... 3 - 26
C-7 Perform Axle Maintenance ............................................................... 3 - 27
B Checklist D Procedures
D-1 Inspect the Forks .............................................................................. 3 - 28
D-2 Adjust the Boom Sequencing Chains ............................................... 3 - 28
D-3 Replace the Hydraulic Tank Return Filter Element ........................... 3 - 31
D-4 Perform Engine Maintenance - Deutz Models .................................. 3 - 32
D-5 Perform Transmission Maintenance ................................................. 3 - 32
D-6 Perform Axle Maintenance ............................................................... 3 - 33
D-7 Perform Engine Maintenance - Perkins Models ................................ 3 - 33
D-8 Perform Engine Maintenance - Deutz Models .................................. 3 - 34
C Checklist E Procedures
E-1 Test or Replace the Hydraulic Oil ..................................................... 3 - 35
E-2 Perform Engine Maintenance - John Deere Models ......................... 3 - 36
E-3 Perform Engine Maintenance - Perkins Models ................................ 3 - 36
E-4 Perform Engine Maintenance - Perkins Models ................................ 3 - 37
E-5 Perform Engine Maintenance - Perkins Models ................................ 3 - 37
E-6 Perform Engine Maintenance - John Deere Models ......................... 3 - 38
E-7 Perform Engine Maintenance - Perkins Models ................................ 3 - 38
E-8 Perform Engine Maintenance - Deutz Models .................................. 3 - 39
E-9 Perform Engine Maintenance - Perkins Models ................................ 3 - 39

June 2007
GTH-636 • GTH-644 • GTH-842 • GTH-844 • GTH-1048 • GTH-1056 Part No. 97487
TABLE OF CONTENTS
x
Section 4 Rev Repair Procedures
Introduction .................................................................................................. 4 - 1
C Boom Components
1-1 Boom Angle Limit Switch (all models except GTH-636) ..................... 4 - 2
1-2 Boom ................................................................................................. 4 - 3
1-3 Boom Lift Cylinder ............................................................................ 4 - 15
1-4 Boom Extension Cylinder ................................................................. 4 - 17
1-5 Fork Level Cylinder .......................................................................... 4 - 18
1-6 Fork Rotate Cylinder (option) ........................................................... 4 - 20
B Operator's Compartment
2-1 Operator's Compartment .................................................................. 4 - 23
2-2 Machine Controls ............................................................................. 4 - 32
C Fuel and Hydraulic Tanks
3-1 Fuel Tank ......................................................................................... 4 - 38
3-2 Hydraulic Tank ................................................................................. 4 - 39
B Engines
4-1 Engines ............................................................................................ 4 - 40
4-2 Engine Fault Codes - John Deere 4045TF275 Engine ..................... 4 - 41
C Transmission
5-1 Transmission .................................................................................... 4 - 42
B Hydraulic Pumps
6-1 Hydraulic Pump ................................................................................ 4 - 44
C Manifolds
7-1 Main Valve Manifold Components .................................................... 4 - 48
7-2 Tilt Limiter Manifold Components ..................................................... 4 - 49
7-3 Dual Pilot Check Manifold Components ........................................... 4 - 50
7-4 Boom Activated Rear Lock-up Manifold Components ...................... 4 - 51
7-5 Fork Rotate Speed Manifold Components (option) ........................... 4 - 52
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Our service manuals are essential resources for professional mechanics and DIY enthusiasts alike. Whether you're working on the GTH-844, GTH-842, GTH-644, or any other model within the serial number range, our manuals provide comprehensive guidance. The manual, part number 97487, revision D, dated June 2007, covers models 636, 644, 842, and more. For models from GTH0806A-8418, GTH0806B-6958, GTH0606A-8418, GTH0606B-6271, and others like the GTH-1048 and GTH-1056, our manuals offer detailed insights to support your repair and maintenance needs.