BASE AS-JOYSTICK 4551123 - Caterpillar

TECHNICAL INFORMATION BULLETIN June 18, 2003
PRODUCT FAMILY(S) Engines 3456 (9BZ1-Up)
Component Code(s) 1212SUBJECT: Possible Cam Gear Bolt Failures
PROBLEM:
The 9X-8872 Locking Bolts in the 204-2114 Gear Group may be failing. This gear design uses eight bolts on both sides of the cam gear to secure the two 204-2113 Plates on both sides of the gear. When these bolts fail, engine damage can occur.
SOLUTION:
Caterpillar is investigating this issue. In order to prevent significant engine damage while this problem is being investigated, the following maintenance requirement and inspection procedure are added until a permanent fix is implemented. Refer to the Operation and Maintenance Manual (SEBU6959) and the Disassembly and Assembly Manual (SENR1068).
Maintenance Interval Schedule ? Prime Power DPGDS Generator Set Engines
Every 9500 L (2500 US gal) of Fuel or 250 Service Hours or Yearly Cam gear bolts ? Replace/Inspect
Maintenance Interval Schedule ? Standby Power DPGDS Generator Set Engines
Every 9500 L (2500 US gal) of Fuel or 100 Service Hours or Yearly Cam gear bolts ? Replace/Inspect
Camshaft Gear Inspection Procedure
Start By:
Remove the front cover. Refer to Disassembly and Assembly, "Front Cover ? Remove".
Remove the camshaft gear. Refer to Disassembly and Assembly, "Camshaft Gear - Remove and Install".
The following inspection procedure can be used to determine the condition of the 9X-8872 Locking Bolts (1).
Apply a static inspection torque of 40 N·m in the tightening direction.
The 9X-8872 Locking Bolts (1) must not move when the inspection torque is applied.
If the 9X-8872 Locking Bolts (1) move, remove the bolts and inspect for damage. All bolts that are removed must be cleaned and replaced using 155-0695 High Strength Thread Lock or be replaced by new 9X-8872 Locking Bolts (1).
Note: Replacement bolts must be tightened to a torque of 50 N·m.
Kevin E. Kyle
Service Engineer
Customer Support Division
Defense & Federal Products
Phone: (309) 578-4562
Facsimile: (309) 578-3739
Email: kyle_kevin_e
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