Procedure to Rework the Air Conditioning Control System{7320} Caterpillar

Industrial Tractor:

TK371 (S/N: WBG1-186)

TK381 (S/N: WBH1-236)

Track Feller Buncher:

TK711 (S/N: 1011-244)

TK721 (S/N: 1021-344)

TK722 (S/N: 1031-444)

TK732 (S/N: 1041-544)

TK741 (S/N: 2021-224)

TK751 (S/N: 3011-324)

TK752 (S/N: 3021-424)

1090 (S/N: BZJ1-1119)

1190 (S/N: BZK1-1219)

1190T (S/N: BZL1-1319)

1290T (S/N: BZM1-1419)

1390 (S/N: B3F1-205)

Wheel Feller Buncher:

533 (S/N: CDR1-194)

543 (S/N: ASJ1-159)

TK370 (S/N: WBD1-144)

TK380 (S/N: WBE1-171)

Introduction

This Special Instruction contains procedures on reworking the 199-3159 Air Conditioner Case Gp . This rework will improve the service life of the air conditioning control system. The rework will also help prevent unwanted shutdown of the air conditioning control system.

Do not perform any procedure in this publication or order any parts until you understand the information that is contained in this publication.

This Special Instruction is available through the normal literature distribution system.

This publication can be found on the Caterpillar Service Information System (SIS).

Required Parts

Rework Procedure

1. Remove the covers and the ducting in order to gain access to the 199-3159 Air Conditioner Case Gp .

Show/hide table



Illustration 1	g01320278
199-3159 Air Conditioner Case Gp

2. Remove two 3E-6477 Relay As (1). Retain one of the relays for installation later. Remove 201-5402 Heater and Air Conditioner Harness As (2). Note the location of the cable straps for installation of the new harness.

Show/hide table



Illustration 2	g01320342

3. Remove 199-7933 Control (3) and the associated mounting hardware. Remove 3E-5464 Temperature Switch (REFRIGERANT) (5) and the associated mounting hardware. Retain these parts for installation later. Remove 199-7931 Bracket As (4) .

Show/hide table



Illustration 3	g01320354

4. Install 202-9041 Gasket (6) onto the bottom side of 296-6041 Bracket As (7) .

Show/hide table



Illustration 4	g01320362

5. Install control (3), switch (5), and new bracket (7) with the hardware that was previously retained.

Show/hide table



Illustration 5	g01320371

6. Install new 169-7443 On Delay Timer As (REFRIGERANT COMPRESSOR CYCLE LIMITER) (9) onto bracket (7) with 6V-7646 Hard Washer (8) and 5C-2890 Nut (10) .

Show/hide table



Illustration 6	g01320432

7. Install new 278-8247 Heater and Air Conditioner Harness As (11). Use three 3S-2093 Cable Straps at locations (12) that were noted in Step 2.

Show/hide table



Illustration 7	g01320388
(A) Connection for the air mode actuator (B) Connection for the air door actuator (C) Connection for the 199-7933 Control (D) Connection for the new 169-7443 On Delay Timer As (REFRIGERANT COMPRESSOR CYCLE LIMITER) (E) Connection for the 3E-5464 Temperature Switch (REFRIGERANT) (F) Connection for the motor (G) Connection for the main cab harness (H) Connection for the low pressure switch (J) Connection for the high pressure switch

8. Connect new 278-8247 Heater and Air Conditioner Harness As (11) to the connections that are shown in Illustration 7.

   Note: The cap on the 4-Pin connector at connection (D) must be removed in order to connect the harness to the new 169-7443 On Delay Timer As (REFRIGERANT COMPRESSOR CYCLE LIMITER) .

Show/hide table



Illustration 8	g01320454

Show/hide table



Illustration 9	g01323174

9. Install the 3E-6477 Relay As that was retained in Step 2 at location (13). This is the connection for the power relay for the heating and air conditioning system. Illustration 9 shows this connection. Cover the connectors for the clutch relay (A/C) and the remote condenser relay with electrical tape. These connectors are not used on this machine configuration.

   Note: The power for the air conditioner clutch is provided by the new 169-7443 On Delay Timer As (REFRIGERANT COMPRESSOR CYCLE LIMITER) .