Hummer H3. Manual — part 735

SECOND/THIRD GEAR ONLY OR FIRST/FOURTH GEARS ONLY

Second/Third Gears Only or First/Fourth Gears Only

NO FIRST OR SECOND GEAR/NO THIRD OR FOURTH GEAR

No 1st or 2nd/No 3rd or 4th

NO SECOND GEAR, NO FOURTH GEAR AND NO REVERSE GEAR

No Second Gear, No Fourth Gear and No Reverse Gear

checkballs

Input Housing Assembly
(620-621, 646-655)

3-4 clutch or forward clutch plates worn

Excessive clutch plate travel

Cut or damaged 3-4 clutch or forward clutch piston seals

Porosity in input clutch housing or piston

3-4 clutch piston checkball stuck, damaged or not sealing

Restricted apply passages

Forward clutch piston retainer and ball assembly not
seating

Sealing balls loose or missing

Input housing (621) cracked or broken

Case (103)

3rd accumulator retainer and ball assembly not seating

2-4 Servo Assembly (13-28) 2nd apply piston seals missing, cut or damaged

Checks

Causes

1-2 Shift Solenoid Valve
(367A)

Sediment is in the valves

The electrical connection is faulty

Damaged seal

Checks

Causes

2-3 Shift Solenoid Valve
(367B)

Sediment is in the valves

The electrical connection is faulty

Damaged seal

Checks

Causes

Reaction Sun Shell (670)

Broken spline on reaction sun shell/replace shell.

2007 Hummer H3

2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3

THIRD GEAR ONLY

Third Gear Only

3-2 FLARE OR TIE-UP

3-2 Flare or Tie-Up

NO 3-4 SHIFT, SLIPS OR ROUGH 3-4 SHIFT

No 3-4 Shift/Slipping or Rough 3-4 Shift

Checks

Causes

System Voltage

12 volts not supplied to transmission

Electrical short (pinched solenoid wire)

Solenoid not grounded

Checks

Causes

3-2 Shift Solenoid Valve
Assembly (394)

Shorted or damaged

Contamination

Damaged Seal

Check ball not seating

Checks

Causes

Oil Pump Assembly (4)

Pump cover retainer and ball assembly omitted or
damaged

Faces not flat

Valve Body Assembly (60)

Valves stuck

2-3 Shift valve train

Accumulator valve

1-2 Shift valve train

3-2 Shift solenoid valve assembly

Spacer plate or gaskets incorrect, mispositioned or
damaged

2-4 Servo Assembly (13-28)

Incorrect band apply pin

Missing or damaged servo seals

Porosity in piston, cover or case

Damaged piston seal grooves

2007 Hummer H3

2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3

NO REVERSE OR SLIPS IN REVERSE

No Reverse or Slips in Reverse

Plugged or missing orifice cup plug

Case (103)

3rd Accumulator retainer and ball assembly leaking

Porosity in 3-4 accumulator piston or bore

3-4 Accumulator piston seal or seal grooves damaged

Plugged or missing orifice cup plug

Restricted oil passage

Input Housing Assembly
(621)

Refer to No 2-3 Shift or 2-3 Shift Slips, Rough or
Hunting.

2-4 Band Assembly (602)

Worn or misassembled

Checks

Causes

Input Housing Assembly
(602)

3-4 Apply ring stuck in applied position

Forward clutch not releasing

Turbine shaft seals missing, cut or damaged

Manual Valve Link (89)

Disconnected

Valve Body Assembly (60)

2-3 Shift valve stuck

Manual linkage not adjusted

Spacer plate and gaskets incorrect, mispositioned or
damaged

Lo overrun valve stuck

Orificed cup plug restricted, missing or damaged

Reverse Input Clutch
Assembly (605-614)

Clutch plate worn

Reverse input housing and drum assembly cracked at
weld

Clutch plate retaining ring out of groove

Return spring assembly retaining ring out of groove

Seals cut or damaged

Restricted apply passage

Porosity in piston

Belleville plate installed incorrectly

2007 Hummer H3

2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3

NO PART THROTTLE OR DELAYED DOWNSHIFTS

No Part Throttle or Delayed Downshifts

Excessive clutch plate travel

Oversized housing

Lo and Reverse Clutch
(694-696)

Clutch plates worn

Porosity in piston

Seals damaged

Return spring assembly retaining ring mispositioned

Restricted apply passage

Reaction Sun Shell (670)

Broken spline on reaction sun shell/replace shell

Checks

Causes

Input Housing Assembly
(621)

3-4 Apply ring stuck in applied position

Forward clutch not releasing

Turbine shaft seals missing, cut or damaged

Manual Valve Link (89)

Disconnected

Valve Body Assembly (60)

2-3 Shift valve stuck

Manual linkage not adjusted

Spacer plate and gaskets incorrect, mispositioned or
damaged

Lo overrun valve stuck

Orificed cup plug restricted, missing or damaged

Reverse Input Clutch
Assembly (606-614)

Clutch plate worn

Reverse input housing and drum assembly cracked at
weld

Clutch plate retaining ring out of groove

Return spring assembly retaining ring out of groove

Seals cut or damaged

Restricted apply passage

Porosity in piston

Belleville plate installed incorrectly

Excessive clutch plate travel

2007 Hummer H3

2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3