A New Fuel Tank Drain And/Or A High Level Fuel Vent Needs To Be Installed On Certain Challenger 75, 75C And 85C Tractors Caterpillar

A New Fuel Tank Drain And/Or A High Level Fuel Vent Needs To Be Installed On Certain Challenger 75, 75C And 85C Tractors

Usage:

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Caterpillar: Confidential Yellow

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.

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 "PS8314" as the Part Number and "7755" as the Group Number. If administered before failure, use "56" as the Warranty Claim Description Code and use "T" as the SIMS Description Code. If administered after failure, use "96" as the Warranty Claim Description Code and use "Z" as the SIMS Description Code.

NOTE: This Revised Service Letter replaces the February 4, 1995 Service Letter. A change was made to the Parts Needed.

Termination Date

February 29, 1996

Problem

The existing fuel tank drain may be difficult to access and/or the existing fuel vent may allow dirt to be ingested into the fuel system on certain Challenger 75, 75C and 85C Tractors.

Affected Product
Model & Identification Number

Tractors That Need A New Fuel Tank Drain

CH75C (4KK1-750)

CH85C (9TK1-354)

Tractors That Need A New High Level Fuel Vent

CH75 (4CJ1-Up)

CH75C (4KK1-499)

Parts Needed

Dealers will need to order parts for this Program.

For Tractors That Need A New Fuel Tank Drain

4 - 4B4276 Washer

2 - 5D1026 Clamp

2 - 3J1907 Seal

1 - 4K8864 Clip

1 - 7K1181 Strap

3 - 4L6454 Clamp-Hose

2 - 9L0945 Bolt-U

2 - 5P4924 Elbow

2 - 8T4896 Washer

4 - 6V8185 Nut

1 - 6V8801 Nut

1 - 1139801 Valve-Ball

For Tractors That Need A New High Level Fuel Vent

For CH75

2 - 6D4636 Clip (For handle with 25.4 mm (1.00 in.) O.D.)

3 - 8M2773 Clip

2 - 1S0994 Clip (For handle with 21.3 mm (.84in.) O.D.)

2 - 7X0578 Washer

1 - 1070592 Service Group

1 - 1145286 Coupling

NOTE: If 1070592 Service Groups are unavailable, refer to Special Instruction SEHS96055-01 for its consist to enable the ordering of individual parts. If individual parts are ordered, do not order the 1V0117 Clips.

For CH75C

2 - 6D4636 Clip

1 - 9G5127 Breather

1 - 3J1907 Seal^**

1 - 3K0360 Seal^*

3 - 4L6454 Bolt

1 - 5M6214 Pipe Plug

3 - 8M2773 Clip

3 - 4P7429 Clip

2 - 5P1075 Washer

220 - 5P1442 Hose

1 - 5P4924 Elbow^**

2 - 5P4961 Clamp

1 - 5P6944 Adapter^*

3 - 3S2093 Strap

1 - 8T4896 Washer

3 - 6V8801 Nut

1 - 3W6188 Bracket

2 - 7X0578 Washer

2 - 0066586 Connector

1 - 1145286 Coupling

^*For fuel tanks with a "boss

^**For fuel tanks with either " or " boss

Action Required

See the attached procedures.

Service Claim Allowances

For Tractors That Need A New Fuel Tank Drain

NOTE: This is a 2 hour job.

For Tractors That Need A New High Level Fuel Vent

NOTE: This is a 2 hour job.

Parts Disposition

Handle the parts in accordance with your Warranty Bulletin on warranty parts handling.

Attach.

(1-Rework Procedure)

Rework Procedure

Drain Rework Instructions

NOTE: Refer to Illustration 1 for location of parts.

1. Remove the 4 hydraulic couplers from the left support bracket.

2. Drill two holes and make two slots as shown in View BB of Illustration 2.

3. Install two 5P4924 Elbows in the 1139801 Valve and align as shown in Illustration 3.

4. Secure the sub assembled valve and elbows to the coupler bracket, using the two 9L0945 U-bolts, two 4B4276 Washers and two 6V8185 Nuts (see Illustration 1).

5. Uncoil the existing drain hose from under the fuel tank. Clip that hose to the 9U2930 Angle that supports the steering motor case drain line. See Illustration 4.

6. Cut hose length and secure it to the inlet side of the valve using a 5D1026 Clamp. Clamp the remainder of the hose to the outlet side of the valve. If the tractor has a PTO, the hose can be secured to the PTO lube line with the 7K1181 Strap.

7. Reassemble the hydraulic couplers.

8. Make sure new drain valve is in the off position. Turn the originally installed valve on and check the operation of the new drain.

Illustration 1

Illustration 2

Illustration 3

Illustration 4

High Level Fuel Vent - CH75 (4CJ)

For installation procedures refer to Special Instruction, SEHS9655-01, "Installation of 1070592 Fuel Tank Vent Service Group". In step 10, replace the use of four 1V0117 Clips (adhesive) up the back of the cab with two 6D4636 or 1S0994 Clips on the handrail and two 8M2773 Clips on the hose.

High Level Fuel Vent - CH75C

Use Special Instruction, SEHS9655-01, "Installation of 1070592 Fuel Tank Vent Service Group" as a general reference. The following items supplement those instructions for C series tractors.

C Series Tractors - Tank Bosses

1. No boss on top of tank:

Drill and tap the fuel filler neck per Illustration 5. Be sure to catch all chips so they do not get into the tank. Install the 66586 Conncector, Hose and Clamp as shown.

2. Tanks with bosses:

Two sizes of bosses have been used. Illustration 6 shows both of those and the parts required for each. Install the parts required for the boss being used.

Hose Routing And Clipping

Special Instruction SEHS9655 shows the use of adhesive clips to secure the vent hose to the back of the cab. Those adhesive clips are replaced by metal clips sized for the grab rails on the cab, and 8M2773 Clips for the vent hose. 6D4636 Clips are for use with 25.4mm (1") grab rails, and 1S0994 Clips are for use with 21.3mm (.84") grab rails.

Illustration 7 shows a typical example of hose routing and clipping. The illustration on the left side of the back page of Special Instruction SEHS9655 shows assembly of the breather and related parts.