PSP FOR WINCH CLUTCH LOCK-UP ON CERTAIN D6H TRACTORS USED IN LOGGING AND PIPELINE APPLICATIONS - PS4363 - MAILED US AND CAN ADA, CACO, COFA, CFEL, COSA Caterpillar

PSP FOR WINCH CLUTCH LOCK-UP ON CERTAIN D6H TRACTORS USED IN LOGGING AND PIPELINE APPLICATIONS - PS4363 - MAILED US AND CAN ADA, CACO, COFA, CFEL, COSA

Usage:

@media screen { div.divFooter { display: none; } } @media print { div.divFooter { position: fixed; bottom: 0; right: 0; } }

Caterpillar: Confidential Yellow

PSP FOR WINCH CLUTCH LOCK-UP ON CERTAIN D6H TRACTORS USED IN LOGGING AND PIPELINE APPLICATIONS - PS4363 - MAILED US AND CAN ADA, 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-186
A-125
AU-122
E-83
O-116
5163   PS4363
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
"PS4363" as Part Number, "7755" as Group Number, and "96" as
Description Code.

Termination Date

September 30, 1990

Problem

There is a brief overlap between the winch clutch engagement and winch brake
release which may cause the tracks to stop momentarily on D6H Tractors if the
winch is operated while the tractor is moving. This momentary stoppage of
the tracks can cause a severe jerking and possibly damage a coupling
ortransmission shaft.

Affected Product

Model Identification
Number Winch Serial Number
D6H 1FJ1-UP  9JA259, 261, 265, 268-270, 272-UP
3ED1-UP  1XB259, 260, 268-278
8KB1-UP  2EC279-352, 354, 356, 258-375,
377-435, 437-513, 515, 517-519,
8FC1-UP 522-524, 526-636, 638-680,
683-693
6FC1-UP
1KD1-UP
2TG1-UP
3YG1-UP
4GG1-UP
5HF1-UP
3ZF1-UP
6CF1-UP
4YC1-UP
4RC1-UP
2KD1-UP
4LG1-UP
7ED1-UP
NOTE: Winches reworked previously may be identified with the letters
"K" or "S" stamped near the serial number plate. A reworked
winch may also be identified by the two tapped holes used to
secure the valve assembly on the front of the case. (See
Illustration 1) The new valve assembly installed as part of the
rework can also be fond by removing 9G1403 Access Cover fond in
Illustration 2.

Parts Needed

1 - 8E0589 Tube Assembly 2 - 5M2894 Washer
1 - 8E0590 Tube Assembly 2 - 0T0573 Capscrew
1 - 9G1404 Gasket 1 - 6Y9349 Valve Assembly
1 - 5K9244 Fitting 1 - 6Y9510 Cover
1 - 6K6826 Fitting

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.
whichever (D/N) (Cost)  (C/L) (Sell)
comes
first
Winch Off Tractor
0-3000 100% 1 0 1 0 0
0-24 mo
3001-5000 33 1/3% .5 0 .5 50% 1
25-36 mo
Winch On Tractor
0-3000 100% 5 0 5 0 0
0-24 mo
3001-5000 33 1/3% 2.5 0 2.5 50% 5
25-36 mo
NOTE: This is a 2-hour job if the winch is off the tractor and a 10-
hour job if the winch is on the tractor.

Parts Disposition

Handle the parts in accordance with your Warranty Bulletin on
warranty parts handling.
Rework Procedure
Note: Use the Service Manual for Disassembly and Assembly; and Testing and
Adjusting instructions not included in this rework procedure.
1. If winch is mounted on the tractor, remove the winch.
2. Drill two 8.2 mm diameter holes using dimensions in Illustration #1.
3. Tap the holes using a 3/8" - 16 tap.
4. Remove the 9G1403 Cover and 9G1404 Gasket. See Illustration #2. Remove
the winch filter.
5. Remove the 9G2035 Tube Assembly. See Illustration #3.
6. Install the 5K9244 Elbow and the 6K6826 Elbow in to the 6Y9349 Valve.
Orient the elbows as shown in Illustration #4.
7. Mount the valve assembly on the inner front wall of the winch case,
using two OT0573 Bolts and two 5M2894 Washers installed in the tapped
holes described in Steps 2 and 3. Coat the bolt threads with 9S3263
Thread Lock.
8. Install the 8E0589 and 8E0590 Tube Assembly. Install the ends of the
tube assemblies to the elbows on the valve assembly first. Then install
the other ends to the existing fittings. See Illustration #4.
9. Remove the 7T6637 Cover and 3S9233 Seal from the filter bypass group.
See Illustration #5.
10. Install the 6Y9510 Cover on the filter bypass group. Position the cover
assembly shown in Illustration #5. ("no inch" mode)
Note: The new 9Y9349 Check Valve is set in the "no inch" mode to agree with
the regular setup of the hydraulic controls. If the group is changed to the
"inch" mode, the check valve plugs (see Illustration 1) must also be
interchanged and the 6Y9510 Cover must be turned over. If the plugs are not
switched, input clutch pressure build-up is slowed, and the brake will
release before the clutch can pick up the load. Fine lowering control is
lost as the input clutch and power from the converter are used to power
through a slipping brake.
11. Remove the 7T6636 Plug and position the 7T6635 Pin as shown in
Illustration #5. Reinstall the 7T6636 Plug.
Note: The 7T6635 Pin should remain in the position described above if the
winch is converted to the "inch" mode of operation.
12. Install the winch filter, the 9G1403 Cover and the 9G1404 Gasket.
13. Install the winch on the tractor and test the operation of the winch.
-2 of 6-
****** IMAGE: SEBE4139.00001.001
CAPTION: Illustration 1 - Drill And Tap Two Holes
-3 of 6-
****** IMAGE: SEBE4139.00001.002
CAPTION: Illustration 2 - Location of Cover And Gasket
-4 of 6-
****** IMAGE: SEBE4139.00001.003
CAPTION: Illustration 3 - Remove Tube Assembly
-5 of 6-
****** IMAGE: SEBE4139.00001.004
CAPTION: Illustration 4 - Location of Parts
-6 of 6-
****** IMAGE: SEBE4139.00001.005
CAPTION: Illustration 5 - "No Inch" Mode