CYLINDER AS 1362463 - Caterpillar

The information supplied in this service letter may not be valid after the termination date of this program. Do not perform the work outlined in this Service Letter after the termination date without first contacting your Caterpillar product analyst.
This Program can only be administered after a failure occurs. The decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS0941" as the Part Number and "7755" as the Group Number. Use "96" as the Warranty Claim Description Code and use "Z" as the SIMS Description Code.
Termination Date
April 30, 1998Problem
The cab heater coils may fail and need to be replaced on certain 12H, 14H, 16H, 120H, 135H, 140H, 143H, 160H and 163H Motor Graders. Cab heater may not bring operator compartment up to an acceptable temperature level. The heater coil may have incorrect hairpin pattern that will only allow coolant to flow through one third of the coil.
Affected Product
Model & Identification Number
12H (4XM1-680 2LR1-283 )
14H (7WJ1-159)
16H (6ZJ1-77)
120H (4MK1-116 6NM1-242 )
135H (3YK1-106)
140H (2ZK1-621 8KM1-374 )
143H (1AL1-99)
160H (9EJ1-251)
163H (5AK1-66)
Parts Needed
1 - 9X9654 Coil Assembly - HeatAction Required
Remove the old heater coil and install new 9X9654 Heater Coil. See the attached rework procedure.
Service Claim Allowances
This is a 3.5-hour job.
Parts Disposition
Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.
Attach.(1-Rework Procedure)Rework Procedure
1. Make certain the engine is running at operating temperature, with the correct regulator (thermostat). The thermostat should be a 1118010 Regulator which is rated at 195 degrees F. If using a 9U5828 Thermometer, the temperature out of the water manifold at the regulator area should be approximately 175 to 178 degrees F.2. Check to see is there is acceptable water flow out of the heater core.3. Check the correct routing of the heater lines. With the 3306 engine, the supply line to the heater comes from the engine oil cooler bonnet and the outlet from the heater returns to the manifold at the water pump housing. On the 120H, 135H and 16H Motor Graders, refer to the lines group in the parts book.4. Visually inspect the heater core to determine if it was correctly manufactured. See Illustration. 5. Install the correct heater core tube configuration.
9X9654 Coil Assembly for H-Series Motor Graders