1996/03/25 Caterpillar

776B, 776C, 784B Tractors;
777B, 777C, 785, 785B, 789, 789B Trucks;
994 Wheel Loaders;
5130, 5230 Excavators

SUPPLEMENT: 02/02/98

Service Magazine, SEPD0298; March 25, 1996; Page 20; "Larger Air Compressors Available"

Disregard the previous supplement for this article in Service Magazine SEPD0327, Page 18, dated October 7, 1996.

In Service Magazine SEPD0298, on Page 21, left hand column, second paragraph, "To install the new larger air compressor on 994 Wheel Loaders see:" add the following information:

* 2W-0216 Refrigerant Compressor Group Modification is NOT required on Remanufactured 3516 (6CL245-Up) Engines.

At the end of the article on Page 25, make note of the following information:

The larger air compressors are also installed on Remanufactured 3500 Machine Engines. Chart K identifies the effectivity of the larger air compressors on Remanufactured 3500 Machine Engines.

--------------- END SUPPLEMENT ---------------

SUPPLEMENT: 10/07/96

Service Magazine; March 25, 1996; Page 20; "Larger Air Compressors Available" for 776B, 776C, 784B Tractors; 777B, 777C, 785, 785B, 789, 789B Trucks; 994 Wheel Loaders; 5130, 5230, Excavators.

At the end of the article, make note of the following information;

The larger air compressors are also installed on Remanufactured 3500 Machine Engines. Chart K identifies the effectivity of the larger air compressors on Remanufactured 3500 Machine Engines.

--------------- END SUPPLEMENT ---------------

This article replaces the article with the same title on Page 9 of the November 20, 1995 issue of Service Magazine.

Larger air compressors are available to increase the air flow rate from 12.0 cfm to 13.2 or 16.5 cfm. To accommodate the larger size of the new air compressors, changes must also be made to the:

* Auxiliary Drive Group

* Refrigerant Compressor Group

* Air Compressor Lines Group

* Front Structure Group

To install the new larger air compressor on 776B, 776C Tractors and 777B, 777C Trucks see:

* Air Compressor Group Components

* Auxiliary Drive Group (Parts Needed To Convert From 1W-8704 To 115-0597)

* 1W-8703 Refrigerant Compressor Group Modification

* Air Compressor Lines Group (Parts Needed To Convert From 2W-0194 To 115-0596

* 2W-0202 And 6I-1392 Front Structure Cover Group Modification

To install the new larger air compressor on 784 Tractors and 785, 785B, 789, 789B Trucks see:

* Air Compressor Group Components

* Auxiliary Drive Group (Parts Needed To Convert From 1W-8704 To 115-0597)

* 2W-0216 Refrigerant Compressor Group Modification

* Air Compressor Lines Group (Parts Needed To Convert From 2W-0194 To 115-0596

* 2W-0202 And 6I-1392 Front Structure Cover Group Modification

To install the new larger air compressor on 994 Wheel Loaders see:

* Air Compressor Group Components

* Auxiliary Drive Group (Parts Needed To Modify The 7E-7521)

* 2W-0216 Refrigerant Compressor Group Modification

* Air Compressor Lines Group (Parts Needed To Convert From 2W-0194 To 113-8162

* 2W-0202 And 6I-1392 Front Structure Cover Group Modification

To install the new larger air compressor 5130 Excavators see:

* Air Compressor Group Component

* Auxiliary Drive Group (Parts Needed To Convert From 1W-8704 To 115-0597)

* 6I-3526 Compressor Lines Group Modification

* 2W-0202 And 6I-1392 Front Structure Cover Group Modification

To install the new larger air compressor 5230 Excavators see:

* Air Compressor Group Component

* Auxiliary Drive Group (Parts Needed To Modify The 7E-7521)

* 107-0755 Compressor Lines Group Modification

* 2W-0202 And 6I-1392 Front Structure Cover Group Modification

Air Compressor Group Components

The 117-0071 (13.2 cfm) Air Compressor Group is adaptable to 776B, 776C, 784B, 777B, 777C, 785, 785B, 994, and 5230 machines. The 119-6318 (13.2 cfm) Air Compressor Group is adaptable to 5130 machines. The 113-8193 (16.5 cfm) Air Compressor Group is adaptable to 789 and 789B machines. The components of the 117-0071, 119-6318, and 113-8193 Air Compressor Groups are identified in Illustration 1 and Chart A.

NOTE: The components of the 117-0071, 119-6318, and 113-8193 Air Compressor Groups are the same except for the compressor groups and Governor assemblies.

Illustration 1. Location of components in the 117-0071, 119-6318, and 113-8193 Air Compressor Groups.

Auxiliary Drive Group (Parts Needed To Convert From 1W-8704 To 115-0597)

Illustration 2 and Chart B identify the parts needed to convert from a 1W-8704 Auxiliary Drive Group to a 115-0597 Auxiliary Drive Group.

Illustration 2. Identification of the parts needed to convert from a 1W-8704 Auxiliary Drive Group to a 115-0597 Auxiliary Drive Group.

Auxiliary Drive Group (Parts Needed To Modify The 7E-7521)

Illustration 3 and Chart C identify the parts needed to modify the 7E-7521 Auxiliary Drive Group.

Illustration 3. Identification of parts needed to modify the 7E-7521 Auxiliary Drive Group.

2W-0216 Refrigerant Compressor Group Modification

Illustration 4 and Chart D identify the parts needed to modify the 2W-0216 Refrigerant Compressor Group.

Illustration 4. Identification of parts needed to modify the 2W-0216 Refrigerant Compressor Group.

1W-8703 Refrigerant Compressor Group Modification

Illustration 5 and Chart E identify the parts needed to modify the 1W-8703 Refrigerant Compressor Group.

Illustration 5. Identification of parts needed to modify the 1W-8703 Refrigerant Compressor Group.

Air Compressor Lines Group (Parts Needed To Convert From 2W-0194 To 115-0596)

Illustration 6 and Chart F identify the parts needed to convert from a 2W-0194 Air Compressor Lines Group to a 115-0596 Air Compressor Lines Group.

Illustration 6. Identification of parts needed to convert from a 2W-0194 Air Compressor Lines Group to a 115-0596 Air Compressor Lines Group.

Air Compressor Lines Group (Parts Needed To Convert From 2W-0194 To 113-8162)

Illustration 7 and Chart G identify the parts needed to convert from a 2W-0194 Air Compressor Lines Group to a 113-8162 Air Compressor Lines Group.

Illustration 7. Identification of parts needed to convert from a 2W-0194 Air Compressor Lines Group to a 113-8162 Air Compressor Lines Group.

6I-3526 Air Compressor Lines Group Modification

Illustration 8 and Chart H identify the parts needed to modify the 6I-3526 Air Compressor Lines Group.

Illustration 8. Identification of parts needed to modify the 6I-3526 Air Compressor Lines Group.

107-0755 Air Compressor Lines Group Modification

Illustration 9 and Chart J identify the parts needed to modify the 107-0755 Air Compressor Lines Group.

Illustration 9. Identification of parts needed to modify the 107-0755 Air Compressor Lines Group.

2W-0202 And 6I-1392 Front Structure Cover Group Modification

The 7N-4951 Cover (part of the 2W-0202 and 6I-1392 Front Structure Cover Groups) has been changed to include another notch. This additional notch provides clearance for the air compressor mounting adapter. Earlier 7N-4951 Covers with one notch can be modified as shown in Illustration 10. Use a grinder to carefully add another notch as per the dimensions.

Illustration 10. Dimensions for modifying earlier 7N-4951 Covers. Dimension (A) = 93.5 mm (3.68 in). Dimension (B) = 20.6 mm (.81 in). Dimension (C) = 15.0 mm (.59 in) radius.