Hummer H2. Manual - part 91

LOCKING HUB CONTROL KNOBS 

Locking Hub Control Knobs 

LUBRICANTS 

See Fluids and Lubricants.  

METAL-CLAD SEALS 

See Seals.  

METALASTIC JOINTS 

See Rubber Joints (Metalastic).  

MODULATOR PINS 

Modulator Pins 

MODULATORS 

Modulators 

Condition 

Code 

Procedure 

Damaged, affecting performance 

A 

Require replacement. 

Missing 

C 

Require replacement. 

Worn, affecting performance 

A 

Require replacement. 

Condition 

Code 

Procedure 

Application incorrect 

B 

Require replacement. 

Missing 

C 

Require replacement. 

Condition 

Code 

Procedure 

Bent, affecting performance 

A 

Require replacement. 

Contaminated (water, fuel, etc.) 

A 

Require replacement. See note below. 

NOTE: Further inspection is required to determine the cause of the contamination 

Housing cracked 

A 

Require replacement. 

Inoperative 

A 

Require replacement. See note below. 

NOTE: Inoperative includes intermittent operation or out of OEM specification. 

Leaking fluid externally 

A 

Require repair or replacement. 

Leaking fluid internally 

A 

Require replacement. 

Leaking vacuum 

A 

Require replacement. 

Nipple broken 

A 

Require replacement. 

 

1998 Chevrolet Pickup C1500 

Uniform Inspection and Communication Standards DRIVE TRAIN AND TRANSMISSION

  

MOUNTS (ENGINE, TRANSAXLE, AND TRANSMISSION) 

Mounts (Engine, Transaxle, and Transmission) 

ODOMETER DRIVES (MECHANICAL) 

See Speedometer/Odometer Drives (Mechanical).  

ODOMETER HEADS (MECHANICAL) 

See Speedometer/Odometer Heads (Mechanical).  

OIL PANS 

See Transmission Pans.  

PANS 

See Transmission Pans.  

PILOT HOLES 

Threads damaged 

A 

Require repair or replacement. 

Threads stripped (threads missing) 

A 

Require replacement. 

Condition 

Code 

Procedure 

Attaching hardware broken 

A 

Require repair or replacement of 

hardware. 

Attaching hardware missing 

C 

Require replacement of hardware. 

Attaching hardware not functioning 

A 

Require repair or replacement of 

hardware. 

Broken 

A 

Require replacement. 

Leaking (hydraulic mount) 

A 

Require replacement. 

Mounting hole worn, affecting 
performance 

A 

Require replacement. 

Mounting hole worn, not affecting 
performance 

No service suggested or required. 

Rubber deteriorated, affecting performance  A 

Require replacement. 

Rubber deteriorated, not affecting 
performance 

No service suggested or required. 

Threads damaged 

A 

Require repair or replacement. 

Threads stripped (threads missing) 

A 

Require replacement. 

 

1998 Chevrolet Pickup C1500 

Uniform Inspection and Communication Standards DRIVE TRAIN AND TRANSMISSION

  

See Dowel Pins, Guides, and Pilot Holes.  

PRESSURE PLATES 

Pressure Plates 

PRESSURE SWITCHES 

See Switches.  

RACES 

See Bearings and Races.  

RUBBER JOINTS (METALASTIC) 

These joints may be found on half and/or drive shafts. They are usually found on European vehicles featuring a 
three-lug drive flange. They may be equipped with a centering ball or pin.  

Rubber Joints (Metalastic) 

Condition 

Code 

Procedure 

Balance weight missing 

C 

Require replacement. 

Broken 

A 

Require replacement. 

Contact surface distorted 

B 

Require replacement. 

Cracks 

B 

Require replacement. 

Fingers bent 

A 

Require replacement. 

Hard spots 

B 

Require replacement. 

Scored 

B 

Require replacement. 

Spring rate less than specifications 

B 

Require replacement. 

Worn, affecting performance 

A 

Require replacement. 

Worn beyond specifications 

B 

Require replacement. 

Worn close to the end of its useful life 

1 

Suggest replacement. 

Condition 

Code 

Procedure 

Drive flange bent 

A 

Require repair or replacement. 

Drive flange damaged, affecting performance 

A 

Require replacement. 

Rubber drive joint cracked 

2 

Suggest replacement. 

Rubber drive joint damaged, affecting 
performance 

A 

Require replacement. 

Rubber drive joint split between mounting holes 

A 

Require replacement. 

Rubber drive joint torn at mounting holes 

A 

Require replacement. 

Rubber drive joint weather-cracked 

No service suggested or 

 

1998 Chevrolet Pickup C1500 

Uniform Inspection and Communication Standards DRIVE TRAIN AND TRANSMISSION

  

SCREENS 

See Filters and Screens.  

SEALS 

Seals 

SEALS (METAL-CLAD) 

See Seals.  

SELECTOR INTERLOCK SYSTEMS 

See Shift Interlock Systems (Selector and Key Interlock Systems).  

SERVOS 

See Actuators (Vacuum).  

SHIFT INTERLOCK SYSTEMS (SELECTOR AND KEY INTERLOCK 
SYSTEMS) 

See: Actuators (Electrical), Cables, Linkages (External), Switches.  

SENSORS 

Sensors 

required. 

Condition 

Code 

Procedure 

Leaking 

A 

Require repair or replacement. See note below. 

NOTE: Require inspection of mating and sealing surface and repair or replace as 
necessary. Check vent. A plugged vent may force fluid past the seal. 

Condition 

Code 

Procedure 

Attaching hardware broken 

A 

Require repair or replacement of 

hardware. 

Attaching hardware missing 

C 

Require replacement of hardware. 

Attaching hardware not functioning 

A 

Require repair or replacement of 

hardware. 

Connector broken 

A 

Require repair or replacement. 

Connector (Weatherpack type) leaking 

A 

Require repair or replacement. 

 

1998 Chevrolet Pickup C1500 

Uniform Inspection and Communication Standards DRIVE TRAIN AND TRANSMISSION