PSP FOR REWORKING THE WINCH CONTROLS ON CERTAIN 518 SKIDDERS - PS4421 - MAILED US AND CANADA, CACO, COFA, CFEL, COSA
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PSP FOR REWORKING THE WINCH CONTROLS ON CERTAIN 518 SKIDDERS - PS4421 - MAILED US AND CANADA, CACO, COFA, CFEL, COSA
NOTE: 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.
U-65 A-37 AU-40 E-41 O-55 5413, 5419, 5163 PS4421 NOTE: This Program can be administered either before or after a failure. In either case the decision whether to apply the Program is made by the dealer. When reporting the repair, use "PS4421" as Part Number, "7755" as Group Number, and "96" as Description Code.
Termination Date
April 30, 1991
Problem
The input clutch discs may fail on certain 518 Skidders if the clutch is modulated. New controls can be installed to increase the service life of the clutch discs by eliminating the ability to modulate the clutch and cause the discs to slip.
Affected Product
Model Identification Number ***** Category 1 ***** ***** Mechanically applied winch drum drag brake ***** 518 94U1298 - 1658* 95U1185 - 1577* * Exclude all of the PINs that were reworked under the July 6, 1987 Service Letter - PS4172. ***** Category 2 ***** ***** Electrically actuated, hydraulically ***** ***** boosted winch drum drag brake (freespool) ***** 518 94U1659 - 2180** 95U1578 - 2416** ** Include all of the PIN's that were reworked under the July 6, 1987 Service Letter - PS4172. ***** Category 3 ***** ***** Hydraulically actuated, hydraulically ***** ***** boosted winch drum brake (freespool) ***** 518 94U2181 - 2250 (Approximate effective PINs) 95U2417 - 2662 (Approximate effective PINs) Note: The identification numbers listed for Category III are approximate. The dealer should be advised to check the identification number of the machine. If it's identification number is near the cutoff identification number, determine which category it is in before ordering parts.
Parts Needed
***** Categories I, II, and III ***** 4 307947 Elbow 9 3J1907 Seal 1 4E2107 Hose As. 1 2R6806 Connector 2 5V4690 Hose As. 1 4E2108 Hose As. 2 5P4295 Clip 1 4E2106 Hose As. 1 8R6686 Guide 1 8E2190 Valve Gp. 5 9S8004 Plug 2 6K9194 Elbow 1 - 3K0360 Seal 1 - 8M0547 Elbow 1 - 8M0505 Connector 1 - 9S4185 Plug ***** Category I and II only ***** 1 6D0679 Knob 1 9C9014 End 1 5B9079 Nut 2 5M3062 Bolt 6 8T4896 Washer 1 9C9418 Lever As. 1 9C9013 Bar As. 1 8R2048 Lever 1 7C5206 Spring 2 9F7882 Pin 1 9C5155 Pin 5 4L6459 Bolt 1 8T4222 Washer 1 6T4265 Sleeve 2 2V8282 Spring 1 6T4266 Pin 2 9B7237 Bolt 1 8R6684 Bracket As. 1 5P8167 Bolt 1 6Y9676 Spring* / 4 5M7914 Spacer / Required on 94U1298-2137 and 4 5M7915 Spacer / 95U1185-2369 only / * Previously reworked machines contain the 6Y9676 Spring identified with a white stripe.
Action Required
See the attached procedure.
Service Claim Allowances
Product Caterpillar Dealer Suggested Customer Suggested smu/age Parts Labor Hrs. Parts Labor Hrs. Parts Labor Hrs. (D/N) (Cost) (C/L) (Sell) 0-3000 100% 4 0 4 0 0 0-24 mo 3001-5000 33 1/3% 2 0 2 50% 4 25-36 mo NOTE: This is an 8-hour job.
Parts Disposition
All parts removed (with the exception of cores used for Caterpillar Remanufactured parts) should be rendered useless and scrapped immediately upon completion of the repair. Attach. (1-Rework Procedure) Rework Procedure 1. Disconnect all of the hose assemblies (and tube assemblies on Category II machines) from the Winch Control Valve. See Illustrations 1, 2, and 3. 2. Remove all other non-winch related components fastened to the plate on which the Winch Control Valve and Winch Hand Control are mounted. See Illustrations 4, 5, and 6. Save the components, they will be used later. 3. Remove the plate with the Winch Hand Control and Winch Control Valve attached. Save the fasteners, they will be used later. 4. (Category I and II) Remove all of the Winch Hand Control parts and Winch Control Valve. These parts will not be reused. (Category III) Remove the Winch Control Valve and 9C9015 Guide. These parts will not be reused. 5. Install and orient the fittings and seals in the new Winch Control Valve. See Illustration 7. 6. (Category I and II Only) Install the new Winch Hand Control and Winch Control Valve onto the plate. See Illustration 8. (Category III) Install the new Winch Control Valve and 8R6686 Guide. See Illustration 8. 7. Remove the hose assemblies listed below. See Illustrations 1, 2, and 3. Function Part Number Drain (valve) 6W9446 Input clutch 6W2408 Freespool drum drag brake* 5G3696 or 9C9731 Winch brake 6W2408 Freespool disconnect 6W2409 * N/A Category I 8. (Category II) Remove the electrical solenoid valve and tube assemblies. See Illustration 2. Remove the Electrical Wiring Harnesses. See Illustration 5. 9. Install the new hose assemblies listed below. See Illustration 9. Function Part Number Drain (valve) 4E2107 Input clutch 5V4690 Freespool drum drag brake 4E2108 Winch brake 5V4690 Freespool disconnect 4E2106 10. Assemble plate with the new winch hand control and winch control valve to operator's platform using original fasteners. 11. Assemble all the components removed from plate in Step 2. 12. Attach the hose assemblies to the new Winch Control Valve. See Illustrations 7 and 9. 13. (94U1298 - 2137 and 95U1185 - 2369 only) Remove the 7T6401 Spring from the 7T5052 Priority Valve Group. See Illustrations 9 and 10. Replace the former spring with a new 6Y9676 Spring. 14. Use the 518 Winch Testing and Adjusting Service Manual, Form No. SENR4083-02 to adjust the input clutch pressure and measure the other pressure checks listed. ****** IMAGE: SEBE4266.00001.001 CAPTION: Illustration 1 - Category 1 ****** IMAGE: SEBE4266.00001.002 CAPTION: Illustration 2 - Category 2 ****** IMAGE: SEBE4266.00001.003 CAPTION: Illustration 3 - Category 3 ****** IMAGE: SEBE4266.00001.004 CAPTION: Illustration 4 - Category 1 ****** IMAGE: SEBE4266.00001.005 CAPTION: Illustration 5 - Category 2 ****** IMAGE: SEBE4266.00001.006 CAPTION: Illustration 6 - Category 3 ****** IMAGE: SEBE4266.00001.007 CAPTION: Illustration 7 - Valve Body ****** IMAGE: SEBE4266.00001.008 CAPTION: Illustration 8 - Control Mounting Group ****** IMAGE: SEBE4266.00001.009 CAPTION: Illustration 9 - Winch Lines Group ****** IMAGE: SEBE4266.00001.010 CAPTION: Illustration 10 - Priority Valve
Caterpillar Information System:
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