HEAD GP-MOTOR 1991090 - Caterpillar

Removal Procedure
Start By:
Remove the fan. Refer to Disassembly and Assembly, "Fan - Remove and Install".
Remove the front cover. Refer to Disassembly and Assembly, "Housing (Front) - Remove".
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Illustration 1 g00721939
Note: Rotate the crankshaft until the timing marks on the following gears are aligned: crankshaft gear, camshaft gear, fuel injection pump gear and idler gear (1) .
Remove outer washer (3) from the idler gear shaft.
Use a suitable puller to remove idler gear (2) .Note: Do not rotate the crankshaft once the idler gear has been removed. If the crankshaft is rotated, the number 1 piston must be set to the top center position. Refer to Testing and Adjusting, "Finding Top Center Position for No. 1 Piston".
Remove the inner washer from the idler gear shaft (not shown). The inner washer is located behind the idler gear.Remove the Idler Gear Shaft
Table 1
Required Tools    
Tool     Part Number     Part Description     Qty    
A     1P-0074     Slide Hammer Puller Gp     1    
B     4C-5651     Threaded Adapter     1    
Illustration 2 g00721895
(4) Idler gear shaft (5) Oil hole (6) O-ring seal
Illustration 3 g00721904
Remove O-ring seal (6) .
Thread tool (B) onto tool (A) .
Use tool (A) to remove idler gear shaft (4) .Install the Idler Gear Shaft
Table 2
Required Tools    
Tool     Part Number     Part Description     Qty    
C         Installation Tool     1    
D     159-9076     Seal Installer Handle     1    
Illustration 4 g00721922
Ensure that oil hole (5) is in the up position.
Use a soft hammer (8) to start the idler gear shaft into the cylinder block.
Illustration 5 g00721925
Use tool (C) and tool (D) to install the idler gear shaft.
Drive the idler gear shaft with the installation tool until the installation tool makes contact with the machined surface of the cylinder block. Installation Procedure
Install O-ring seal (6) .
Install the inner washer onto the idler gear shaft.
Install idler gear (2) .Note: Ensure that the timing marks on the crankshaft gear, the camshaft gear, and the fuel injection pump gear are aligned with the timing marks on the idler gear (1) .
Install the outer washer (3) onto the idler gear shaft.End By:
Install the front cover. Refer to Disassembly and Assembly, "Housing (Front) - Install".
Install the fan. Refer to Disassembly and Assembly, "Fan - Remove and Install".