Hummer H1 (2002+). Manual - part 5

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 General Information, Lubrication and Maintenance  1-17

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TOWING, LIFTING, JUMP STARTING

Vehicle Lifting/Jacking Points

Vehicle jacking points are shown in  Figure 1-11. The vehicle
can be raised with a floor jack at any of the indicated positions.
Jacking can be performed at the front, rear, or at any one
wheel.

In cases where the entire vehicle must be raised, use jack
stands at equidistant points on the frame rails. Use a minimum
of four stands to support the vehicle. Suggested capacity for in-
dividual jack stands is 3 ton, with a vertical reach of 19 in.
(49 cm).

Typical jack stand placement for raising one side of the vehicle
is shown in Figure 1-12. Always be sure the jack stand saddle
is securely engaged and the stand is level.

Vehicle Hoisting

Hummer vehicles can be raised on a hoist for service access.
Drive-on and swivel arm hoists are both acceptable.  Hoist ca-
pacity and width are important. The greater width and weight
of Hummer vehicles require a larger hoisting platform. Do not
use an under capacity hoist, or modify an existing hoist for use;
this practice is neither safe nor recommended.

Figure 1-11:   Vehicle Jacking Points

Figure 1-12:   Typical Jack Stand Placement

REAR

CROSSMEMBER

REAR

LOWER

CONTROL

ARMS

FRAME RAIL

FRONT

CROSSMEMBER

FRONT LOWER

CONTROL ARMS

FRAME RAIL

REAR

 BUMPER

JACK STANDS POSITIONED

UNDER FRAME RAIL

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General Information, Lubrication and Maintenance

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Towing Recommendations

Hummer vehicles can be towed with wheel lift, sling-type, or
flat bed tow equipment.

Flat bed and wheel lift equipment is recommended over sling
type or A-frame equipment.

Towing Cautions:

¥ Remove or secure loads in the towed vehicle

¥ Never use the shackles on the front bumpers as tie down 

points

¥ Always use safety chains on sling towed vehicles

¥ Always follow the transmission/transfer case shift posi-

tion recommendations (Transfer Case in N (Neutral); 
Transmission in P (Park). 

¥ Use a low vehicle trailer for recreational towing (behind 

an RV or other vehicle) when possible. 

¥ Never put chains, cables or straps on any steering com-

ponents.

Flat Bed/Wheel Lift Towing Procedures

Flat bed/wheel lift tow vehicles are highly recommended. They
keep all of the towed vehicle wheels off the pavement. This is
important with full time four wheel drive vehicles.

Loading only requires that the towed vehicle be raised or
winched onto the towing platform. A further advantage of this
type equipment is that tow speed and distance are not limited.
Once the towed vehicle is loaded, set the parking brake, shift
the transmission into Park and install the vehicle tie downs. Tie
down attachment points are shown in  Figure 1-13.

Figure 1-13:   Vehicle Tie-Down Points

FRAME RAIL/

CROSSMEMBER

LOOP

LOOPS

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Conventional Towing Procedures

Front Towing

1.

Loop chains around lower control arms and secure to tow 
sling (Figure 1-14).

2.

Insert 4Ó x 4Ó x 48Ó length of wood between bumper and
sling chains (Figure 1-14).

3.

Raise front end and verify that sling is firmly positioned
against front bumper.

4.

Release parking brakes.

5.

Shift transmission into Park and transfer case into Neutral.

6.

Position tow dollies under rear wheels. Proceed with
towing operations.

Figure 1-14:   Front Towing With Conventional 

Equipment

Rear Towing

1.

Loop sling chain around frame rails adjacent to rear cross-
member and secure to tow sling (Figure 1-15).

2.

Insert 4Ó x 4Ó x 48Ó length of wood between bumper and
sling chains (Figure 1-15).

3.

Raise rear end and verify that sling is firmly positioned
against rear bumper.

4.

Release parking brakes.

5.

Shift transmission into Park and transfer case into Neutral.

6.

Position tow dollies under front wheels. Proceed with
towing operations. 

Figure 1-15:   Rear Towing with Conventional 

Equipment

Conventional Towing When Keys are not 
Available

If the vehicle doors are locked and the keys are not available
you cannot determine that the transmission is in Park and the
transfer case is in ÒNÓ (Neutral). In these situations, you must
use one of the following towing methods:

a.

Use tow dollies at all wheels and flat tow, 

or

b.

Raise the vehicle front or rear and use tow dollies un-
der the wheels not raised.

Recreational Towing

Hummer vehicles can be towed behind an RV if desired. A
low-boy style vehicle trailer is best for this purpose. Flat tow-
ing is not recommended.

CHAIN

ASSEMBLY

WOOD

CROSSBEAM

LOWER

CONTROL ARM

SLING

ASSEMBLY

SLING

ASSEMBLY

SLING

CHAINS

WOOD
BLOCK

CROSSMEMBER

FRAME

RAIL

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General Information, Lubrication and Maintenance

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Jump Starting

Hummer vehicles can be jump started when necessary. Starting
can be performed with a portable starting unit, separate booster
batteries, or the battery in another vehicle.

Certain Cautions and Warnings must be observed when jump
starting a vehicle. They are:

¥ If the battery in another vehicle is being used for jump 

starting, do not allow the two vehicles to touch. Contact 
can result in damage to the electrical system in both ve-
hicles.

¥ Always connect negative to ground and positive to posi-

tive.

¥ Never jump start a vehicle with a frozen battery. This 

practice could lead to personal injury.

¥ Never jump start a battery when electrolyte level is be-

low the top of the cell plates.

¥ Do not allow jumper cable clamps to touch after con-

necting them to the booster battery.

¥ Never allow open flame near batteries, especially during 

jump start operations or when batteries are charging. 
Personal injury could occur in either case.

¥ Never use 24 volt booster equipment, or equipment that 

is NOT negative ground. Either will seriously damage 
the vehicle electrical system. 

¥ Remove all jewelry from hands and wrists to avoid arc-

ing caused by accidental contact with battery current 
source.

Jump Start Procedure

1.

Set parking brake and shift transmission into Park.

2.

Do not jump start if low or dead battery is: frozen,
cracked, has loose terminal socket, electrolyte level is
below cell plates, or indicates less than 9 volts across
terminals. Install temporary or replacement battery
instead. However, if battery is only low on charge and is
OK otherwise, proceed with jump starting.

3.

Connect positive (+) jumper cable to battery positive
terminal (Figure 1-16).

NOTE:  An adapter may be required to connect the cables to
some side mount terminals.

4.

Connect negative (-) jumper cable to generator mounting
bracket (Figure 1-16). Be sure cable clamp is securely
attached.

5.

If portable booster machine is being used, verify that
machine is at 12 volt setting. Higher volt/amp settings can
damage vehicle electrical system.

6.

Start vehicle. Disconnect jumper cables immediately after
engine startup.

Figure 1-16:   Jumper Cable Connections

BATTERY

POSITIVE TERMINAL

JUMPER

POSITIVE (+)

CABLE

GENERATOR

MOUNTING

BRACKET

JUMPER

NEGATIVE (-)

CABLE