This service manual provides general directions for
accomplishing service and repair procedures. Following
the procedures in this manual will help assure safety and
equipment reliability.
Read, understand and follow the information in this
manual, and obey all locally approved safety practices,
procedures, rules, codes, regulations and laws.
These instructions cannot cover all details or variations in
the equipment, procedures, or processes described, nor
provide directions for meeting every possible contingency
during operation, maintenance, or testing. When additional
information is desired consult the local JLG distributor.
Many factors contribute to unsafe conditions: carelessness,
fatigue, overload, inattentiveness, unfamiliarity, even
drugs and alcohol, among others. For optimal safety,
encourage everyone to think, and to act, safely.
Appropriate service methods and proper repair
procedures are essential for the safety of the individual
doing the work, for the safety of the operator, and for the
safe, reliable operation of the machine.All references to
the right side, left side, front and rear are given from the
operator’s seat looking in a forward direction.
Supplementary information is available from JLG in the
form of Service Bulletins, Service Campaigns, Service
Training Schools, the JLG website, other literature and
through updates to the manual itself.
1.2DISCLAIMER
1.4DO NOT OPERATE TAGS
Place Do Not Operate Tags on the ignition key switch and
the steering wheel before attempting to perform any
service or maintenance. Remove key and disconnect
battery leads.
1.5SAFETY INFORMATION
To avoid possible death or injury, carefully read,
understand and comply with all safety messages.
In the event of an accident, know where to obtain medical
assistance and how to use a first-aid kit and fire
extinguisher/fire suppression system. Keep emergency
telephone numbers (fire department, ambulance, rescue
squad/paramedics, police department, etc.) nearby. If
working alone, check with another person routinely to
help assure personal safety.
1.5.1Safety Alert System and Signal Words
DANGER
DANGER indicates an imminently hazardous situation
which, if not avoided, will result in death or serious injury.
WARNING
All information in this manual is based on the latest
product information available at the time of publication.
JLG reserves the right to make changes and
improvements to its products, and to discontinue the
manufacture of any product, at its discretion at any time
without public notice or obligation.
1.3OPERATION & SAFETY MANUAL
The mechanic must not operate the machine until the
Operation & Safety Manual has been read and
understood, training has been accomplished and
operation of the machine has been completed under the
supervision of an experienced and qualified operator.
An Operation & Safety Manual is supplied with each
machine and must be kept in the manual holder located
in the cab. In the event that the Operation & Safety
Manual is missing, consult the local JLG distributor before
proceeding.
1-2
WARNING indicates a potentially hazardous situation
which, if not avoided, could result in death or serious
injury.
CAUTION
CAUTION indicates a potentially hazardous situation
which, if not avoided, may result in minor or moderate
injury.
G6-42A, G9-43A, G10-43A
Safety Practices
1.6SAFETY INSTRUCTIONS
Following are general safety statements to consider before
performing maintenance procedures on the telehandler.
Additional statements related to specific tasks and
procedures are located throughout this manual and are
listed prior to any work instructions to provide safety
information before the potential of a hazard occurs.
For all safety messages, carefully read, understand and
follow the instructions before
1.6.1Personal Hazards
PERSONAL SAFETY GEAR: Wear all the protective
clothing and personal safety gear necessary to perform
the job safely. This might include heavy gloves, safety
glasses or goggles, filter mask or respirator, safety shoes
or a hard hat.
LIFTING: NEVER lift a heavy object without the help of at
least one assistant or a suitable sling and hoist.
1.6.2Equipment Hazards
LIFTING OF EQUIPMENT: Before using any lifting
equipment (chains, slings, brackets, hooks, etc.), verify
that it is of the proper capacity, in good working order, and
is properly attached.
NEVER stand or otherwise become positioned under a
suspended load or under raised equipment. The load or
equipment could fall or tip.
DO NOT use a hoist, jack or jack stands only to support
equipment. Always support equipment with the proper
capacity blocks or stands properly rated for the load.
HAND TOOLS: Always use the proper tool for the job;
keep tools clean and in good working order, and use
special service tools only as recommended.
proceeding.
1.6.3General Hazards
SOLVENTS: Only use approved solvents that are known
to be safe for use.
HOUSEKEEPING: Keep the work area and operator’s
cab clean, and remove all hazards (debris, oil, tools, etc.).
FIRST AID: Immediately clean, dress and report all injuries
(cuts, abrasions, burns, etc.), no matter how minor the
injury may seem. Know the location of a First Aid Kit, and
know how to use it.
CLEANLINESS: Wear eye protection and clean all
components with a high-pressure or steam cleaner
before attempting service.
When removing hydraulic components, plug hose ends
and connections to prevent excess leakage and
contamination. Place a suitable catch basin beneath the
machine to capture fluid run-off.
It is good practice to avoid pressure-washing electrical/
electronic components. In the event pressure-washing
the machine is needed, ensure the machine is shut down
before pressure-washing. Should pressure-washing be
utilized to wash areas containing electrical/electronic
components, it is recommended a maximum pressure of
750 psi (52 bar) at a minimum distance of 12 in (30,5 cm)
away from these components. If electrical/electronic
components are sprayed, spraying must not be direct and
for brief time periods to avoid heavy saturation,
Check and obey all Federal, State and/or Local
regulations regarding waste storage, disposal and
recycling.
G6-42A, G9-43A, G10-43A
1-3
Safety Practices
1.6.4Operational Hazards
ENGINE: Stop the engine before performing any service
unless specifically instructed otherwise.
VENTILATION: Avoid prolonged engine operation in
enclosed areas without adequate ventilation.
SOFT SURFACES AND SLOPES: NEVER work on a
machine that is parked on a soft surface or slope. The
machine must be on a hard level surface, with the wheels
blocked before performing any service.
FLUID TEMPERATURE: NEVER work on a machine
when the engine, cooling or hydraulic systems are hot.
Hot components and fluids can cause severe burns.
Allow systems to cool before proceeding.
FLUID PRESSURE: Before loosening any hydraulic or
diesel fuel component, hose or tube, turn the engine
OFF. Wear heavy, protective gloves and eye protection.
NEVER check for leaks using any part of your body; use
a piece of cardboard or wood instead. If injured, seek
medical attention immediately. Diesel fluid leaking under
pressure can explode. Hydraulic fluid and diesel fuel
leaking under pressure can penetrate the skin, cause
infection, gangrene and other serious personal injury.
Relieve all pressure before disconnecting any
component, part, line or hose. Slowly loosen parts and
allow release of residual pressure before removing any
part or component. Before starting the engine or applying
pressure, use components, parts, hoses and pipes that
are in good condition, connected properly and are
tightened to the proper torque. Capture fluid in an
appropriate container and dispose of in accordance with
prevailing environmental regulations.
RADIATOR CAP: The cooling system is under pressure
and escaping coolant can cause severe burns and eye
injury. To prevent personal injury, NEVER remove the
radiator cap while the cooling system is hot. Wear safety
glasses. Turn the radiator cap to the first stop and allow
pressure to escape before removing the cap completely.
Failure to follow the safety practices could result in death
or serious injury.
FLUID FLAMABILTITY: DO NOT service the fuel or
hydraulic systems near an open flame, sparks or smoking
materials.
NEVER drain or store fluids in an open container. Engine
fuel and hydraulic fluid are flammable and can cause a
fire and/or explosion.
DO NOT mix gasoline or alcohol with diesel fuel. The
mixture can cause an explosion.
PRESSURE TESTING: When conducting any test, only
use test equipment that is correctly calibrated and in good
condition. Use the correct equipment in the proper
manner, and make changes or repairs as indicated by the
test procedure to achieve the desired result.
LEAVING MACHINE: Lower the forks or attachment to
the ground before leaving the machine.
TIRES: Always keep tires inflated to the proper pressure
to help prevent tipover. DO NOT over-inflate tires.
NEVER use mismatched tire types, sizes or ply ratings.
Always use matched sets according to machine
specifications.
MAJOR COMPONENTS: Never alter, remove, or
substitute any items such as counterweights, tires,
batteries or other items that may reduce or affect the
overall weight or stability of the machine.
BATTERY: DO NOT charge a frozen battery.Charging a
frozen battery may cause it to explode. Allow the battery
to thaw before jump-starting or connecting a battery
charger.
1.7SAFETY DECALS
Check that all safety decals are present and readable on
the machine. Refer to the Operation & Safety Manual
supplied with machine for information.
* High pressure oil easily punctures skin causing serious injury,gangrene or death.* If injured, seek emergency medical help. Immediate surgery is required to remove oil.* Do not use finger or skin to check for leaks.* Lower load or relieve hydraulic pressure before loosening fittings.
1
1
2.1REPLACEMENT PARTS AND
WARRANTY INFORMATION
Before ordering parts or initiating service inquiries, make
note of the machine serial number. The machine serial
number plate (1) is located as indicated in the figure.
Note: The replacement of any part on this machine with
any other than JLG authorized replacement parts can
adversely affect the performance, durability, or safety of
the machine, and will void the warranty. JLG disclaims
liability for any claims or damages, whether regarding
property damage, personal injury or death arising out of
the use of unauthorized replacement parts.
A warranty registration form must be filled out by the JLG
distributor, signed by the purchaser and returned to JLG
when the machine is sold and/or put into use.
Registration activates the warranty period and helps to
assure that warranty claims are promptly processed. To
guarantee full warranty service, verify that the distributor
has returned the business reply card of the warranty
registration form to JLG.
4. CLAMP LOAD LISTED FOR SHCS IS SAME AS GRADE 8 OR CLASS 10.9 AND DOES NOT REPRESENT FULL STRENGTH
CAPABILITY OF SHCS. IF HIGHER LOAD IS REQUIRED, ADDITIONAL TESTING IS REQUIRED.
SOCKET HEAD CAP SCREWS
Magni Coating*
Torque
(Dry) K = .17
K=0.16
K=0.15
2. ALL TORQUE VALUES ARE STATIC TORQUE MEASURED PER STANDARD AUDIT METHODS TOLERANCE = ±10%
NOTES: 1. THESE TORQUE VALUES DO NOT APPLY TO CADMIUM PLATED FASTENERS
*3. ASSEMBLY USES HARDENED WASHER OR FASTENER IS PLACED AGAINST PLATED STEEL OR RAW ALUMINUM
MY4670J
Torque
Loctite® 262™
OR
Vibra-TITE™ 131
Torque
Loctite® 242™ or 271™
OR
Vibra-TITE™ 111 or 140
OR Precoat 85®
2.2.1SAE Fastener Torque Chart
(Continued)
G6-42A, G9-43A, G10-43A
2-5
General Information and Specifications
SizeTPIBolt Dia
Tensile
Stress Area
Clamp Load
See Note 4
InSq InLBIN-LB[N.m]IN-LB[N.m]IN-LB[N.m]
4400.11200.00604
480.11200.00661
6320.13800.00909
400.13800.01015
8320.16400.01400
360.16400.01474
10240.19000.01750
320.19000.02000
1/4200.25000.031828601431612915
280.25000.036432801641914817
InSq InLBFT-LB[N.m]FT-LB[N.m]FT-LB[N.m]
5/16180.31250.05244720253520252025
240.31250.05805220253525352025
3/8160.37500.07757000456040553550
240.37500.08787900507045603550
7/16140.43750.10639550709565905070
200.43750.1187107008011070956080
1/2130.50000.1419127501051459513080110
200.50000.15991440012016511015090120
9/16120.56250.182016400155210140190115155
180.56250.203018250170230155210130175
5/8110.62500.226020350210285190260160220
180.62500.256023000240325215290180245
3/4100.75000.334030100375510340460280380
160.75000.373033600420570380515315430
7/890.87500.462041600605825545740455620
140.87500.509045800670910600815500680
181.00000.60605150086011707751055645875
121.00000.663059700995135589512157451015
1 1/871.12500.76306870012901755116015809651310
121.12500.856077000144519651300177010851475
1 1/471.25000.969087200181524701635222513651855
121.25001.073096600201527401810246015102055
1 3/861.37501.1550104000238532452145291517852430
121.37501.3150118100270536802435331020302760
1 1/261.50001.4050126500316543052845387023703225
121.50001.5800142200355548353200435026653625
4. CLAMP LOAD LISTED FOR SHCS IS SAME AS GRADE 8 OR CLASS 10.9 AND DOES NOT REPRESENT FULL STRENGTH
CAPABILITY OF SHCS. IF HIGHER LOAD IS REQUIRED, ADDITIONAL TESTING IS REQUIRED.
SOCKET HEAD CAP SCREWS
Torque
(Dry)
K = .20
Torque
(Loctite® 242TMor 271
TM
OR Vibra-TITETM111 or
140 OR Precoat 85®
K=0.18
Zinc Yellow Chromate Fasteners*
2. ALL TORQUE VALUES ARE STATIC TORQUE MEASURED PER STANDARD AUDIT METHODS TOLERANCE = ±10%
NOTES: 1. THESE TORQUE VALUES DO NOT APPLY TO CADMIUM PLATED FASTENERS
*3. ASSEMBLY USES HARDENED WASHER OR FASTENER IS PLACED AGAINST PLATED STEEL OR RAW ALUMINUM
Torque
(Loctite® 262
TM
or Vibra-
TITE
TM
131)
K=0.15
MY4680J
2.2.1SAE Fastener Torque Chart
(Continued)
2-6
G6-42A, G9-43A, G10-43A
2.2.2Metric Fastener Torque Chart
SizePITCH
Tensile
Stress
Area
Clamp
Load
Torque
(Dry or Loctite®
263
TM
)
Torque
(Lub)
Sq mmKN[N.m][N.m][N.m][N.m]
30.55.032.191.31.01.21.4
3.50.66.782.952.11.61.92.3
40.78.783.823.12.32.83.4
50.814.206.186.24.65.66.8
6120.108.74117.99.412
7128.9012.618131619
81.2536.6015.926192328
101.558.0025.250384555
121.7584.3036.788667997
14211550.0140105126154
16215768.3
219164197241
182.519283.5301226271331
202.5245106.5426320383469
222.5303132.0581436523639
243353153.5737553663811
273459199.510808109701130
303.5561244.01460110013201530
333.5694302.01990149017902090
364817355.52560192023002690
424.51120487.04090307036804290
4. CLAMP LOAD LISTED FOR SHCS IS SAME AS GRADE 8 OR CLASS 10.9 AND DOES NOT
REPRESENT FULL STRENGTH CAPABILITY OF SHCS. IF HIGHER LOAD IS REQUIRED,
ADDITIONAL TESTING IS REQUIRED.
*3. ASSEMBLY USES HARDENED WASHER OR FASTENER IS PLACED AGAINST PLATED
STEEL OR RAW ALUMINUM
Values for Zinc Yellow Chromate Fasteners
CLASS 8.8 METRIC BOLTS
CLASS 8 METRIC NUTS
NOTES: 1. THESE TORQUE VALUES DO NOT APPLY TO CADMIUM PLATED FASTENERS
2. ALL TORQUE VALUES ARE STATIC TORQUE MEASURED PER STANDARD AUDIT
METHODS TOLERANCE = ±10%
MY4690J
Torque
Loctite® 262™
OR
Vibra-TITE™ 131
Torque
Loctite®
242™ or 271™
OR
Vibra-TITE™
111 or 140
General Information and Specifications
G6-42A, G9-43A, G10-43A
2-7
General Information and Specifications
SizePITCH
Tensile
Stress
Area
Clamp
Load
K = 0.20
K= 0.18
K=0.15
Sq mmKN[N.m][N.m][N.m]
30.55.033.13
3.50.66.784.22
40.78.785.47
50.814.208.85
6120.1012.5
7128.9018.025.222.718.9
81.2536.6022.836.532.827.4
101.558.0036.1706555
121.7584.3052.512511595
14211571.6200180150
16215797.8
315280235
182.5192119.5430385325
202.5245152.5610550460
222.5303189.0830750625
243353222.01065960800
273459286.0154513901160
303.5561349.5209518851575
333.5694432.5285525702140
364817509.0366533002750
424.51120698.0586552754395
Values for Zinc Yellow Chromate Fasteners
CLASS 10.9 METRIC BOLTS
CLASS 10 METRIC NUTS
CLASS 12.9 SOCKET HEAD CAP SCREWS M3 - M5*
4. CLAMP LOAD LISTED FOR SHCS IS SAME AS GRADE 8 OR CLASS 10.9 AND DOES NOT
REPRESENT FULL STRENGTH CAPABILITY OF SHCS. IF HIGHER LOAD IS REQUIRED,
ADDITIONAL TESTING IS REQUIRED.
*3. ASSEMBLY USES HARDENED WASHER OR FASTENER IS PLACED AGAINST PLATED
STEEL OR RAW ALUMINUM
NOTES: 1. THESE TORQUE VALUES DO NOT APPLY TO CADMIUM PLATED FASTENERS
2. ALL TORQUE VALUES ARE STATIC TORQUE MEASURED PER STANDARD AUDIT
METHODS TOLERANCE = ±10%
MY4700J
Torque
Loctite® 262™
OR
Vibra-TITE™ 131
Torque Dry
or
Loctite® 263™
Torque
Lube OR Loctite®
242™ or 271™
OR
Vibra-TITE™
111 or 140
2.2.2Metric Fastener Torque Chart
(Continued)
2-8
G6-42A, G9-43A, G10-43A
2.2.2Metric Fastener Torque Chart
SizePITCH
Tensile
Stress
Area
Clamp Load
See Note 4
K = .17
K = .16
K = .15
Sq mmkN[N.m][N.m][N.m]
30.55.03
3.50.66.78
40.78.78
50.814.20
6120.1012.5131211
7128.9018.0212019
81.2536.6022.8312927
101.558.0036.1615854
121.7584.3052.510510095
14211571.6170160150
162157
97.8265250235
182.5192119.5365345325
202.5245152.5520490460
222.5303189.0705665625
243353220.0900845790
273459286.0131512351160
303.5561349.5178016801575
333.5694432.5242522852140
364817509.0311529302750
424.51120698.0498546904395
CLASS 12.9 SOCKET HEAD CAP SCREWS
M6 AND ABOVE*
4. CLAMP LOAD LISTED FOR SHCS IS SAME AS GRADE 8 OR CLASS 10.9 AND DOES NOT
REPRESENT FULL STRENGTH CAPABILITY OF SHCS. IF HIGHER LOAD IS REQUIRED,
ADDITIONAL TESTING IS REQUIRED.
*3. ASSEMBLY USES HARDENED WASHER OR FASTENER IS PLACED AGAINST PLATED
STEEL OR RAW ALUMINUM
NOTES: 1. THESE TORQUE VALUES DO NOT APPLY TO CADMIUM PLATED FASTENERS
2. ALL TORQUE VALUES ARE STATIC TORQUE MEASURED PER STANDARD AUDIT
METHODS TOLERANCE = ±10%
Magni Coating*
MY4710J
Torque
Loctite® 262™
OR
Vibra-TITE™ 131
Torque
Lube OR Loctite®
242™ or 271™
OR
Vibra-TITE™
111 or 140
Torque Dry
or
Loctite® 263™
(Continued)
General Information and Specifications
G6-42A, G9-43A, G10-43A
2-9
General Information and Specifications
2.2.3Hydraulic Hose Torque Chart
O-Ring Face Seal & JIC Torque Chart
SizeORFSJICFlats Method
4
6
8
10
12
16
20
24
13 lb-ft
(18 Nm)
23 lb-ft
(31 Nm)
40 lb-ft
(54 Nm)
60 lb-ft
(81 Nm)
136 lb-ft
(100 Nm)
115 lb-ft
(156 Nm)
170 lb-ft
(230 Nm)
200 lb-ft
(271 Nm)
13 lb-ft
(18 Nm)
23 lb-ft
(31 Nm)
40 lb-ft
(54 Nm)
60 lb-ft
(81 Nm)
136 lb-ft
(100 Nm)
115 lb-ft
(156 Nm)
170 lb-ft
(230 Nm)
200 lb-ft
(271 Nm)
1.5 to 1.75
1 to 1.5
1.5 to 1.75
1.5 to 1.75
1.0 to 1.5
0.75 to 1.0
0.75 to 1.0
0.75 to 1.0
Flats Method:
1. If equipped, lubricate o-ring with hydraulic oil. Hand
tighten the swivel nut until no lateral movement of
the swivel nut can be detected. Average hand torque
is 3 lb-ft (4 Nm).
2. Mark a dot on one of the swivel nut flats and another
dot in line on the hex of the adapter it’s connecting
to.
3. Use the double wrench method while tightening to
avoid hose twist.
4. After the connection has been properly tightened,
mark a straight line across the connecting parts, not
covering the dots indicating that the connection has
been properly tightened.
32N/A
Note: By definition the “Flats Method“ will contain some
variance. Use the “Flats Method” only when accessibility
with a torque wrench is not possible.
Torque Wrench:
1. Identify the appropriate application and refer to the
above chart for the correct torque value.
2. If equipped, lubricate o-ring with hydraulic oil. Hand
tighten the swivel nut until no lateral movement of
the swivel nut can be detected. Average hand torque
is 3 lb-ft (4 Nm).
3. Use the double wrench method while tightening to
avoid hose twist.
4. Torque wrench must be held at the center of the grip.
Apply constant force until it clicks.
5. After the connection has been properly tightened,
mark a straight line across the connecting parts
indicating that the connection has been properly
tightened.
270 lb-ft
(366 Nm)
0.75 to 1.0
2-10
G6-42A, G9-43A, G10-43A
General Information and Specifications
2.3SPECIFICATIONS
2.3.1Travel Speeds
G6-42AG9-43A & G10-43A
First Gear3.7 mph (5,6 km/h)3.2 mph (5,1 km/h)
Second Gear8.0 mph (12,9 km/h)7.0 mph (11,2 km/h)
Third Gear16.1 mph (25,9 km/h)14.0 mph (22,5 km/h)