Hummer H1 (2006+). Manual — part 227

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Wheels and Tires/Central Tire Inflation System (CTIS)

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Removal

1.

Raise and secure the hood.

2.

Disconnect the deflate valve electrical connector (Figure 6-62).

3.

Remove the screws and the deflate valve from the manifold.

Cleaning and Inspection

Clean and inspect the deflate valve and bracket. Check for cracks and stripped threads. Replace if defective.

Installation

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

NOTE: Apply sealant to the threads prior to installation.

1.

Secure the deflate valve to the manifold with the screws (Figure 6-62).

2.

Connect the deflate valve electrical connector.

3.

Lower and secure the hood.

Figure 6-62: Deflate Valve Assembly Mounting

DUST EXCLUDER REPLACEMENT

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

Removal

1.

Raise and secure the hood.

2.

Remove dust excluder from the manifold (Figure 6-63).

Cleaning and Inspection

Clean and inspect the dust excluder. Check for cracks and stripped threads. Replace if defective.

Installation

ELECTRICAL

CONNECTOR

DEFLATE

VALVE

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Wheels and Tires/Central Tire Inflation System (CTIS) 6-59

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

NOTE: Apply sealant to the threads prior to installation.

1.

Install the dust excluder on the manifold (Figure 6-63).

2.

Lower and secure the hood.

Figure 6-63: Dust Excluder Location

FRONT SUPPLY TUBE AND HOSE REPLACEMENT

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

The HUMMER H1 CTIS uses rubber hoses, nylon tubing, and reinforced (braided) lines. Damaged portions of any air line type
should be removed, discarded, and replaced with a new section. Leaks in air lines usually develop where there is constant rubbing
or friction against another component, existing air lines, fasteners, frame rail, or air line clamp. Such leaks are usually small and
difficult to detect unless adequate air pressure of approximately 20-30 psi (138-207 kPa) is in the line. If a leak is suspected, apply
soap suds to the affected area for easier detection and replace damaged section.

CTIS SUPPLY LINE REPLACEMENT

1.

Disconnect the supply line at the pump/valve assembly (Figure 6-64).

2.

Disconnect the supply hose at the T-fitting secured to the front frame cross member (Figure 6-65).

3.

Remove the tie straps securing the hose.

4.

Work the line out from under the vehicle rather than through the engine compartment.

5.

Tape ends of the new hose to prevent dirt entry.

6.

Work the line up to the pump/valve assembly from underneath the vehicle.

7.

Remove the tape from the hose ends and connect the hose to the T-fitting and the pump/valve assembly.

8.

Secure the new hose with tie straps.

9.

Make sure the line is clear of suspension and the engine components.

MANIFOLD

DUST EXCLUDER

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Wheels and Tires/Central Tire Inflation System (CTIS)

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Figure 6-64: Front and Rear Supply Line Connections

Figure 6-65: Supply Hose Connection

FRONT CTIS LINE REPLACEMENT

1.

Disconnect the line at the front hub (Figure 6-66).

2.

Loosen the clamp on the bracket attached to the lower control arm, then move the air line out of the bracket (Figure 6-67).

3.

Disconnect the front air line at the T-fitting secured to the front cross member.

4.

Cut the tie straps and remove the front air line.

5.

Tape the ends of the new line to prevent dirt entry. Then route the line to the front wheel and the T-fittings.

6.

Secure the hose to the fittings and in the clamp on the lower control arm bracket.

7.

Install the tie straps as needed.

Figure 6-66: 45˚ Angle Line Connection to Hub

REAR SUPPLY LINE

FRONT SUPPLY LINES

SUPPLY LINE

CROSSMEMBER

T-FITTING

AIR LINE TO

FRONT WHEEL

HUB

45˚

FITTING

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Wheels and Tires/Central Tire Inflation System (CTIS) 6-61

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Figure 6-67: Line Bracket and Clamp Location

REAR CTIS LINE REPLACEMENT

1.

Disconnect the line at the rear wheel and at the T-fitting (Figure 6-68).

2.

Remove the line from the clamp on the lower control arm and from the rear hub.

3.

If working on the right rear line, remove the clamp over the cross member to remove the line (Figure 6-69).

4.

Tape the ends of the new line to prevent dirt entry.

5.

Connect the line to the T-fitting and the rear hub.

6.

Secure the line in the control arm clamp.

7.

If working on the right rear line, secure the line to the cross member the with clamp (Figure 6-69).

Figure 6-68: T-Fitting Location

AIR LINE

LOWER CONTROL ARM

BRACKET

CLAMP

T-FITTING

LEFT REAR

UPPER CONTROL ARM