STEERING BRAKE GROUP 8P4985 - Caterpillar

ACTION REQUIRED
If the fan studs are leaking oil, pull the stud and apply a silicon sealantto the stud shank surface.
See the attached rework procedure.SERVICE CLAIM ALLOWANCES
Product smu/age whichevercomes first Caterpillar Dealer Suggested Customer Suggested
Parts (D/N) Labor Hrs (Cost) Parts Labor Hrs Parts (C/L) Labor Hrs (Sell)
0-500,0000-60 Mo 100% 100% 0 0 0 0Labor Hour BreakdownLaborSMCS Code Hours Description1000-074 0.3 Wash1000-035 0.2 Troubleshoot1166-079 2.0 R&I Timing Gear Cover(Peanut), TightenBolts, and Apply Gasket Maker1237-063 0.5 Grind Grooves(5EK1-UP, 6TS1-UP,1LW1-14868, 5DS1-572 Only)1000-031 0.3 Test After
Repair times are for this repair only - if any duplicaterepairs are completed at this time (same work order), they cannot be claimed. Some Ford and Western Star Chassis may require an additional0.5 hours to remove the fan drive. Use SMCS Code 1359-010 ES. If only the fan studs are leaking oil, claim only this repairon labor code 1359-010 for 1.0 hour under this service letter. However,if the studs are leaking and are repaired in conjunction with other repairsin this letter, claim 1.0 hour along with the labor listed above.PARTS DISPOSITION
Handle the parts in accordance with your WarrantyBulletin on warranty parts handling.Attach. (1-Rework Procedure)Rework ProcedureRepair Procedure with Front Cover NOT Removed
Perform the tightening of the front plate retainingbolts. (See Illustration 1)
Remove the front camshaft access cover.
Remove the three bolts and retaining plate thatretain the 6I3618 Gear Assembly. Remove the gear assembly.
Remove the bolt, five nuts, and six washers thatretain the 6I3621 Idler Gear Stub Shaft Assembly.
Remove the idler gear stub shaft assembly. (Onsome engines, you may need to take a hammer and brass rod and lightly tapthe stud or leave the nut on the stud with the outer edge of the nut flushwith the outer edge of the stud and lightly tap the stud) (Illustration2), towards the block approximately 1/8 of an inch. This will give enoughclearance to remove the stub shaft.
(Step 6 is not needed on 1LW14869-Up, 5DS573-Up,2WS1-Up, 1MM1-Up or if this Service Letter, PS5291, has been previouslycompleted). With stub shaft removed and viewing the back side, use a diegrinder and a 1-1/2 inch diameter grinding wheel, Caterpillar referencenumber 4C3855, to grind two relief channels approximately .020 of an inchdeep (make sure the depth is correct). (Illustration 3)
With the 6I3621 Idler Gear Stub Shaft Assemblyremoved, remove the two 3/8 bolts/washers (0S1594/5M2894) that are locatedbehind the shaft (retain the front plate to block). Clean the oil fromthe plate, stub shaft, and the two bolts using 4C4079 Cleaner or equivalent.
Apply a Quick Cure Primer (1223781 Pump Spray/4C9500Aerosol) to bolt shank. Install new 5M2894 Washers. Apply the primer toboth sides of the washers. Apply 1U8846 Gasket Maker to both sides of thewashers.
Install the two bolts and standard washers. Tightento 55 +/- 10 Nm (41 +/- 7 lb ft). See Illustration 1, callout (9).
Tighten the 3/8 inch bolt located directly belowthe idler gear stub shaft with an open end wrench. Tighten the bolt toa torque of 55 +/- 10 Nm (41 +/- 7 lb ft). See Illustration 1, callout(10).
Apply the Quick Cure Primer to the plate surfacethat the stub shaft will be re-installed on and to the backside of theidler gear stub shaft assembly.
Apply a