Open Rops Heater Relay Caterpillar

TRACK-TYPE LOADERS

Problem:

The 3E-7278 Heater Relay may fail prematurely in Open ROPS machines due to being exposed to moisture.

Solution:

Replace the 3E-7278 Relay (8) with the 103-0799 Relay (1) and change the mounting location of the relay. On newer machines this relay has already been changed.

Replacement Procedure 1

1. Park the machine and disconnect the power. See appropiate Operation & Maintenance Manual.

2. Remove the faulty 3E-7278 Relay (8). See Illustration 1. Note: Retain the 5C-9553 Bolts (6) and 8T-4205 Washers (7).

3. Remove the electrical connector (A) for the relay, part of 113-2675 Harness . Install two 9W-0852 Pins (2), one 3E-3364 Receptacle (3), and one 3E-3365 Wedge (4) where the connector was removed.

4. Drill two mounting holes for the 103-0799 Relay 6.60 mm (.26 in) in diameter. The holes are 27.0 mm (1.062 in) from the right edge (C), 15.17 mm (.60 in) up from the bottom edge (B), and 65.86 mm (2.59 in) apart (D). See Illustration 2.

5. Install the 103-0799 Relay (1) using the 5C-9553 Bolts (6), 8T-4205 Washers (7), and 5C-9553 Nuts (5). Mount the Relay so that the terminals are facing to the left.

Illustration 1.

3E-7278 Relay (8). Existing Weldnuts (11) to mount the 3E-7278 Relay. Connector (A) to be removed.

Illustration 2.

Mounting Plate. Existing weldnuts (11) to mount the 3E-7278 Relay. New Mounting Holes (12) for the 103-0799 Relay.

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