Hummer H1 (2002+). Manual - part 109

______________

 Wheels and Tires/Central Tire Inflation System (CTIS)  6-51

®

05745159

AIR INTAKE LINE REPLACEMENT

Removal 

1.

Raise and secure hood.

2.

Loosen hose clamp and disconnect air intake hose from
connector  (Figure 6-73).

Figure 6-73:   Air Intake Hose 

3.

Loosen clamp and disconnect air cleaner elbow from air
horn.

4.

Remove nut, washer, coupling, connector, and seal from
air horn.

5.

Loosen hose clamp securing air intake hose to compressor
fitting (Figure 6-74).

Figure 6-74:   Air Intake Hose to Fitting

6.

Remove air intake hose.

Cleaning and Inspection

Clean and inspect air intake hose, elbow, coupling assembly
and seal. Check for leaks, cracks, and stripped threads.

CAUTION: Do not allow sealant into air system. Sealant will
damage CTIS components.

NOTE: Apply sealant to threads prior to installation.

Installation 

1.

Connect air intake hose to compressor fitting and secure 
with hose clamp (Figure 6-74).

2.

Install seal, coupling, washer, nut, and connector to air
horn (Figure 6-73).

3.

Connect air cleaner elbow to air horn and secure with
clamp.

4.

Connect air intake hose to air horn connector and secure
with hose clamp.

5.

Lower and secure hood.

TUBE SHIELD REPLACEMENT

1.

Remove bolts, washers and tube shield from wheel.

2.

Install new CTIS decal on tube shield, if necessary.

3.

Install tube shield tab into slot on bracket.

4.

Secure tube shield to spindle with bolts and washers.

Figure 6-75:   Tube Shield Assembly

AIR

INTAKE

HOSE

AIR

HORN

SEAL

ELBOW

CLAMP

CONNECTOR

CLAMP

9-S06-012

CLAMP

FITTING

AIR INTAKE

HOSE

TAB

TUBE SHIELD

SPINDLE

BRACKET

6-52

Wheels and Tires/Central Tire Inflation System (CTIS)

_______________

®

QUICK-DISCONNECT VALVE AND TUBE 
REPLACEMENT

WARNING:  CTIS components are subject to high air
pressure. Always relieve air pressure before loosening
or removing air system components by disconnecting
quick-disconnect valve assemblies. Failure to follow
this warning may result in serious injury.

NOTE:  The replacement of all four quick-disconnect valves
and tube assemblies is identical.

Removal 

1.

Raise and support vehicle.

2.

Remove tube shield.

3.

Remove tube and nut from quick-disconnect valve
(Figure 6-76).

Figure 6-76:   Quick-Disconnect Valve Assembly

CAUTION:  Do not force apart quick-disconnect valve. The
quick-disconnect valve is a one-piece component. Damage to
quick-disconnect valve will result if forced apart.

4.

Remove quick-disconnect valve from spindle.

5.

Disconnect tube from elbow, then remove nut and sleeve
assembly and insert from tube. 

6.

Remove elbow.

Cleaning and Inspection

Clean and inspect tube and quick-disconnect valve. Check for
leaks, stripped threads, and cracks. Replace defective parts.

Installation 

CAUTION: Do not allow sealant into air system. Sealant will
damage CTIS components.

NOTE: Apply sealant to threads prior to installation.

1.

Install quick-disconnect valve into spindle (Figure 6-76).

2.

Install elbow.

3.

Install nut on tube and connect tube to quick-disconnect
valve.

4.

Install nut and sleeve assembly and insert on tube and
connect tube to elbow.

5.

Install tube shield.

6.

Lower vehicle.

QUICK

DISCONNECT

VALVE

NUT

TUBE

INSERT

ELBOW

NUT

SLEEVE

______________

 Wheels and Tires/Central Tire Inflation System (CTIS)  6-53

®

05745159

REAR TUBE CONNECTION SHIELD 
REPLACEMENT

NOTE: The replacement of the left and right rear tube connec-
tion shields is basically the same. This procedure covers the
left rear tube connection shield.

Removal 

Remove two bolts, washers, shield, and two washers from
steering arm cover (Figure 6-77).

Cleaning and Inspection

Clean and inspect shield and mounting hardware. Check for
cracks and stripped threads. Replace defective parts.

Figure 6-77:   Rear Tube Connection Shield

Installation 

Install shield on steering arm cover with two washers, bolts,
and two washers. Tighten bolt to 75 lb-ft (102 N•m)
(Figure 6-77).

GEARED HUB REPLACEMENT (CTIS)

WARNING:  CTIS components are subject to high air
pressure. Always relieve air pressure before loosening
or removing air system components by disconnecting
quick-disconnect valve assemblies. Failure to follow
this warning may result in serious injury.

NOTE: The geared hub spindle has been bored to allow a di-
rect air passage through the spindle to the quick-disconnect
valve assembly. The front of the spindle is bored and tapped to
allow installation of a quick-disconnect coupling. The rear of
the spindle is bored for the insertion of a spindle extension,
which creates an air-tight passageway into the steering arm
cover. A bored hole in the steering arm cover allows the instal-
lation of a rotary seal and an air line, which routes compressed
air to the tires.

Removal 

1.

Remove tube shield.

2.

Remove rear tube connection shield.

Figure 6-78:   Line Connection at Steering 

Arm Cover

3.

Remove line fitting from steering arm cover (Figure 6-78).

4.

Remove geared hub.

Installation 

1.

Install geared hub.

2.

Apply sealant to line fitting and install in steering arm
cover (Figure 6-78).

3.

Install rear tube connection shield.

4.

Install tube shield.

STEERING

ARM COVER

SHIELD

STEERING

ARM COVER

LINE FITTING

AIR LINE

7-S06-036.2

6-54

Wheels and Tires/Central Tire Inflation System (CTIS)

_______________

®

SPINDLE EXTENSION AND SEAL 
REPLACEMENT

Removal 

1.

Remove rear tube connection shield.

2.

Remove four bolts, washers, and steering arm cover from
geared hub (Figure 6-79).

3.

Remove retaining ring and seal from steering arm cover.

4.

Remove spindle extension from spindle.

Figure 6-79:   Spindle Extension and Seal

Cleaning and Inspection

Clean and inspect spindle extension and seal. Check for leaks
and cracks. Replace defective parts.

Installation 

CAUTION: Do not allow sealant or adhesive into air system.
Sealant will damage CTIS components.

1.

Apply sealant to seal and install seal in steering arm cover 
(Figure 6-79).

2.

Secure seal to steering arm cover with retaining ring.

3.

Apply a small amount of adhesive to end of spindle
extension and install into spindle.

4.

Install steering arm cover on geared hub with four washers
and bolts. Tighten bolts to 75 lb-ft (102 N•m).

5.

Install rear tube connection shield.

AUXILIARY AIR HOSE REPLACEMENT

Removal

1.

Raise and secure hood.

WARNING:  The CTIS air system contains air under
high pressure. Always relieve air pressure before loos-
ening or removing air system component(s) by discon-
necting quick-disconnect valves. Failure to follow this
warning may result in personal injury.

2.

Isolate tire by depressing metal tab on quick-disconnect
valve body. The valve body will pop out approximately 
1/4 in. (6 mm) from shuttle. Perform this procedure on
remaining three wheels  (Figure 6-81).

Figure 6-80:   CTIS Quick-Disconnect Valve

3.

Remove auxiliary air valve from tee (Figure 6-81).

STEERING

ARM COVER

SEAL

RETAINING

RING

EXTENSION

GEARED

HUB

DISCONNECTED

CONNECTED

VALVE 

BODY

TAB

SHUTTLE