Hummer H1 (2006+). Manual - part 188

4-32

Cooling System

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3.

Remove the three bolts holding the oil pump housing to the GFD and remove the housing, gerotor pump, relief spring and ball
(Figure  4-28).

Figure 4-28:   Gerotor Pump Assembly

CAUTION: When removing the core plug care must be taken not to damage the sealing surface. It may induce oil leaks.

GEROTOR PUMP

BALL

SPRING

HOUSING

TRANSFER SHAFT

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 Cooling System  4-33

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4.

Remove the input shaft core plug with a small screw and slide hammer close to the outside edge of the core plug (Figure
 4-29).

Figure 4-29:   Core Plug Removal

5.

Install tool J-8814-11 on the output flange (Figure  4-30).

Figure 4-30:   Tool J-8814-11

NOTE: The threads on the input and output shaft are left hand threads.

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Cooling System

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6.

Release the locking tab on the input shaft nut and with tool EN-48032 remove the nut and locking washer (Figure  4-31).

.

Figure 4-31:   Input Shaft Removal

7.

Remove the output shaft nut and remove tool J-8814-11.

CAUTION: DO NOT impact the input shaft out of the housing, damage to the shaft, gear, bearing or the housing may result.

CAUTION: The transfer shaft protrudes past the main case and could be damaged if used to support the main case while pressing
out the input shaft.

8.

Press the input shaft out of the GFD with a press (Figure  4-31).

9.

Remove the seven bolts holding the case halves together and while holding the halves horizontal to the work bench so as to not
drop the input gear or transfer shaft, separate the case halves by lifting the main case from the rear case (Figure  4-32).

10. Remove the input gear and the transfer shaft from the rear case and remove the input shaft seal.

CORE PLUG

NUT

LOCKING WASHER

INPUT SHAFT

MAIN CASE

FAN CASE

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5745804

Figure 4-32:   Main Case and Rear Case Removal and Installation

MAIN CASE

REAR CASE

TRANSFER SHAFT

INPUT GEAR

12-1-05