PSP FOR RELOCATING THE DIFFERENTIAL BREATHER TO REDUCE THE POSSIBILITY OF DIFFERENTIAL OIL LEAKAGE (SLOBBER) ON CERTAIN 785 AND 789 TRUCKS - PS4580 - MAILED US AND CANADA, COFA, CFEL, COSA, LIMITED CACO Caterpillar

PSP FOR RELOCATING THE DIFFERENTIAL BREATHER TO REDUCE THE POSSIBILITY OF DIFFERENTIAL OIL LEAKAGE (SLOBBER) ON CERTAIN 785 AND 789 TRUCKS - PS4580 - MAILED US AND CANADA, COFA, CFEL, COSA, LIMITED CACO

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Caterpillar: Confidential Yellow

PSP FOR RELOCATING THE DIFFERENTIAL BREATHER TO REDUCE THE POSSIBILITY OF DIFFERENTIAL OIL LEAKAGE (SLOBBER) ON CERTAIN 785 AND 789 TRUCKS - PS4580 - MAILED US AND CANADA, COFA, CFEL, COSA, LIMITED CACO

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-53
A-41.1
AU-34
E-38
O-41
PRODUCT SUPPORT PROGRAM FOR RELOCATING THE DIFFERENTIAL BREATHER TO
REDUCE THE POSSIBILITY OF DIFFERENTIAL OIL LEAKAGE (SLOBBER) ON
CERTAIN 785 AND 789 TRUCKS
3283   PS4580
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 "PS4580"
as Part Number, "7755" as Group Number, and "96" as Description
Code.

Termination Date

March 31, 1992

Problem

Oil may leak or slobber from the differential oil breather that is located on
the front face of the axle housing of certain 785 and 789 Trucks. Remote
mounting of the breather on the frame will reduce the possibility of oil
leakage or slobber.

Affected Product

Model Identification Number
785  8GB430-474
789  9ZC466-513, 515

Parts Needed

1 - 4B4845 Plug
1 - 7D6282 Hose Assembly
3 - 3S8664 Clip

Action Required

See the attached procedure.

Service Claim Allowances

Product Caterpillar Dealer Suggested Customer Suggested
smu Parts Labor Hrs. Parts Labor Hrs. Parts Labor Hrs.
(D/N) (Cost)  (C/L) (Sell)
0-5000 100% 2 0 0 0 0
NOTE: This is a 2-hour job.

Parts Disposition

Handle the parts in accordance with your Warranty Bulletin on warranty parts
handling.
Rework Procedure
1. Remove the 5B6009 Coupling and the 4H6112 Breather from the 3B7743
Nipple.
2. Remove the nipple from the 032143 Elbow. Remove the elbow from the
front face of the axle housing and install the 4B4845 Plug.
3. NOTE: Use grease on the drill bit and tap to prevent material from
falling into the axle housing.
Part A - 789 Trucks
On the left side of the axle housing, place a mark 682 mm from the front
face of the axle housing (A-frame mounting face) and 371 mm in from the
spindle mounting face. Drill a .375" dia. hole. Tap the hole to a
minimum depth of 13 mm using a 18 NPSF tap.
Part B - 785 Trucks
Drill a .375" dia. hole on the left rear of the axle housing on the boss
located in front of the left strut mounting. Tap the hole to a minimum
depth of 13 mm using a 18 NPSF tap.
4. Install the 032143 Elbow at this location. Attach the 7D6282 Hose
Assembly. Attach the 5B6009 Coupling and the 4H6112 Breather to the
hose. Route hose assembly as shown in the illustrations. Secure the
hose using the 3-3S8664 Clips.
****** IMAGE: SEBE4546.00001.001
CAPTION: Illustration 1 - 785 Trucks
****** IMAGE: SEBE4546.00001.002
CAPTION: Illustration 2 - 789 Trucks