Usage:
914G (7ZM, 9WM) 928G (6XR, 7SR) Wheel Loaders IT14G (8ZM, 1WN) IT28G (8CR, 9AR) Integrated Toolcarriers.
Reference: SENR6760; Service Manual, 914G Wheel Loader, IT14G Integrated Toolcarrier; SEBU6868, May 1995; Operation and Maintenance Manual, 914G Wheel Loader; Maintenance Intervals, Every 50 Service Hours or Weekly, Cab Air System-Clean Filters, Page 94.
Reference: SENR6760; Service Manual, 914G Wheel Loader, IT14G Integrated Toolcarrier; SEBU6869, May 1995; Operation & Maintenance Manual, IT14G Integrated Toolcarrier; Maintenance Intervals; Every 50 Service Hours or Weekly, Cab Air System-Clean Filters, Page 94.
Reference: SENR1215; Service Manual, 928G Wheel Loader, IT28G Integrated Toolcarrier; SEBU7015, October 1996; Operation and Maintenance Manual, 928G Wheel Loader; Maintenance Section, Maintenance Interval Schedule, Every 10 Service Hours or Daily, Cab Air Filter-Clean/Replace, Page 111.
Reference: SENR1215; Service Manual, 928G Wheel Loader, IT28G Integrated Toolcarrier; SEBU7020, October 1996; Operation and Maintenance Manual, IT28G Integrated Toolcarrier; Maintenance Section, Maintenance Interval Schedule, Every 10 Service Hours or Daily, Cab Air Filter-Clean/Replace, Page 118.
Reference: SENR1215; Service Manual, 928G Wheel Loader, IT28G Integrated Toolcarrier; SEBU7020-01, August 1998; Operation and Maintenance Manual, IT28G Integrated Toolcarrier; Maintenance Section, Maintenance Interval Schedule, Every 10 Hours or Daily, Cab Air Filter-Clean/Replace, Page 137.
Reference: SEBP2343, August 1995; Parts Manual, 914G Wheel Loader; Operator Station, Enclosed ROPS Operator Arrangement with Air Conditioning, Page 311; Cab Air Filter Group, Page 295; Air Conditioner Lines Group, Page 307; Air Duct Group, Page 294.
Reference: SEBP2344, August 1995; Parts Manual, IT14G Integrated Toolcarrier; Operator Station, Enclosed ROPS Operator Arrangement with Air Conditioning, Page 326; Cab Air Filter Group, Page 311; Air Conditioner Lines Group, Page 322; Air Duct Group, Page 310.
Reference: SEBP2344-01, July 1977; Parts Manual, IT14G Integrated Toolcarrier; Operator Station, Enclosed ROPS Operator Arrangement with Air Conditioning, Page 326; Cab Air Filter Group, Page 311; Air Conditioner Lines Group, Page 322; Air Duct Group, Page 310.
Reference: SEBP2382, December 1996; Parts Manual, 928G Wheel Loader, Operator Station, Enclosed ROPS Operator Arrangement with Air Conditioner, Page 473; Cab Air Filter Group, Page 446; Air Conditioner Lines Group, Page 466; Air Duct Group, Page 444; Frame and Body, Side Panel Group, Page 292.
Reference: SEBP2382-01, July 1998, Volume II, Pages 605-1254; Parts Manual, 928G Wheel Loader; Operator Arrangement, Page 1115; Cab Air Filter Group, Page 1034; Cab Air Filter Group, Page 1035; Air Conditioner Lines Group, Page 1078; Air Duct Group, Page 1030; Frame and Body, Side Panel Group, Page 659.
Reference: SEBP2383, December 1996; Parts Manual, IT28G Integrated Toolcarrier; Operation Station, Enclosed ROPS Operator Arrangement with Air Conditioner, Page 472; Cab Air Filter Group, Page 448; Air Conditioner Lines Group, Page 467; Air Duct Group, Page 446; Frame and Body, Side Panel Group, Page 269.
Illustration 1.
The 163-9324 Instruction Plate.
To improve the performance and reliability of the air conditioning system, the R134A refrigerant charge weight has been changed, four checks can be performed and three modifications can be made. Two of the three modifications are for the 928G and IT28G machines only.
The new charge pressure for the machines is shown in Chart 1. The new 163-9324 Instruction Plate is now available. Please see Illustration 1.
It shows the recommended refrigerant charge weight. It is a direct replacement for the former 110-6393, 114-0059 and 130-4677 Instruction Plates in the enclosed ROPS operator arrangement with the air conditioning attachment.
Remove the former instruction plate. Attach the new 163-9324 Instruction Plate to the air conditioner compressor mounting bracket or the air conditioner inlet hose near the compressor.
To improve poor air conditioner performance, check the following items:
1. The cab air filters, all machines listed;
2. The condenser seal, 928G and IT28G machines only; and
3. The air duct and platform seals, all machines listed.
There are three system changes which can improve performance or make maintenance easier. They are:
1. Add circular louvers;
2. Add a refrigerant condenser filter (928G and IT28G machines only); and
3. Replace the air conditioner side panels (928G and IT28G machines only).
Air Conditioning Performance Checks
1. Cab Air Filters
Illustration 2.
Machines may have air filters installed that are made from an incorrect material. The air filter should be made from an open pore material that allows air to easily pass through it.
The 111-8738 Filter (1), in Illustration 2, is one of two filters for machine cab. It is located on the left side of the machine under the steps. Refer to the maintenance section of the proper operation & maintenance manuals for the correct procedure for cleaning or replacing the filter.
The 113-0305 Air Filter (2), in Illustration 2, is the second filter for machine cab. This filter is located near the left side of the operator's seat. Clean or replace the air filter if it is dirty. Refer to the maintenance section of the proper operation and maintenance manual for the correct procedure for cleaning or replacing the cab air filter.
2. The Condenser Seal
Illustration 3.
Position of 112-9736 Seal.
Check to ensure that 112-9736 Seal (1) is installed between the hood and the front structure. It is part of the air conditioner lines group. The seal improves the air conditioner system performance by blocking hot air from engine compartment (2) from being drawn into the air conditioner condenser area (3). The 112-9736 Seal should be 840 mm (33.1 in) long.
3. The Air Duct and Platform Seals
Illustration 4.
Duct an platform seal positions.
Refer to Illustration 4. It is recommended that 5P-0805 Seal (1) that is between duct (2), floorplate assembly (3) and duct assembly (4) be inspected. Seal (1) is part of the air duct group. Floorplate assembly (3) is part of the operator's platform, also known as the platform group.
To inspect the seal:
1. Turn the fan blowers to ON.
2. Refer to Illustration 4. Move your hand around the areas where seal (1) is installed.
3. If air is felt, then seal (1) needs to be replaced.
4. Turn the fan blower to OFF.
The 5P-0805 Seal is available in 3200 mm (125.984 in) lengths.
NOTE: Apply 5P-0805 Seal (1) to the metal cab surfaces before installation of the plastic ducts.
System Changes
1. Add Circular Louvers
Illustration 5.
107-6025 Duct Assembly.
Circular louvers can be installed to increase air flow to the operator. The two rectangular 8Y-6388 Louver Assemblies (1) that face the operator can be replaced with two circular 8Y-6391 Louver Assemblies. The two rectangular louvers are part of the 107-6025 Duct Assembly in the air duct group.
Illustration 6.
Circular louver dimensions.
The new louvers can be installed by using two mounting plates and eight screws. The mounting plate layout is shown in Illustration 6. Make two mounting plates to the dimensions listed in Chart 2.
Illustration 7.
Louver plate installation.
The installation instructions are:
1. Refer to the top view in Illustration 7. Remove the two rectangular 8Y-6388 Louver Assemblies (1).
2. Pick a louver opening on which you will work.
3. Refer to the bottom view in Illustration 7. Position plate assembly (2) over the louver opening as show in Illustration 7.
4. Install the four 104-2091 Flat Head Screws (3) that hold the plate in place.
5. Cut the duct assembly to match the circular opening on the plate.
Illustration 8.
The 8Y-6391 Louver Assemblies.
6. Disassemble rotating bezel (2) from mounting base (1).
7. Install mounting base (1) into the plate.
8. Install the four 104-2091 Flat Head Screws (3) that hold mounting base (1) in place.
9. Insert rotating bezel (2) into mounting base (1) until it snaps into its rotating positions.
10. Repeat Step 3, Step 4, Step 5, Step 6, Step 7 , Step 8 and Step 9 on the other rectangular louver opening.
Illustration 9.
The circular 8Y-6391 Louvers installed.
Illustration 9 shows the new, circular 8Y-6391 Louver Assemblies installed into the mounting plates.
NOTE: Close the lower duct louvers to maximize air flow to the circular louvers.
2. Add A Refrigerant Condenser Filter
Illustration 10.
The refrigerant condenser.
For 928G and IT28G machines that experience refrigerant condenser plugging when working in dusty applications, the 166-5371 Filter (1) can be installed on top of 119-8200 Refrigerant Condenser (5). The refrigerant condenser is part of the air conditioner lines group.
The 166-5371 Filter can be ordered through the parts system. It should be cleaned as necessary because a dirty filter will lead to poor air conditioner performance and premature system failure.
Illustration 11.
The material required to install the filter is listed in Chart 3. Hold down brackets (4) are to be made on site. A bracket is shown in Illustration 11. Make brackets (4) from eleven gauge cold rolled steel. This is the same material from which the condenser case assembly end plates are made. Make the four brackets to the dimensions listed in Chart 4. The dimension tolerance for bracket (4) is ± 1.5 mm (.059 in).
The instruction to install the filter are:
1. Refer to Illustration 10. Lay 166-5371 Filter (1) on top of condenser (5).
2. Place a bracket on filter (1) with the bracket hole over a weld nut hole.
3. Place washer (2) onto bolt (3).
4. Insert the bolt and washer combination through the hole in bracket (4) and into the weld nut hole in the refrigerant condenser case.
5. Tighten bolt (3) to a torque of 55 ± 10 N·m (40 ± 7 lb ft).
6. Repeat Step 2, Step 3, Step 4 and Step 5 on the three remaining bracket positions.
3. Replace The Air Conditioner Side Panels
New air conditioner panel assemblies are available for 928G and IT28G machines working in dusty applications. They are removable and allow easier access to the refrigerant condenser for cleaning.
Illustration 12.
New panel assemblies.
The new 149-1305 Panel Assembly (1) is a direct replacement for the former 122-6248 Panel Assembly. The new 149-1307 Panel Assembly (2) is a direct replacement for the former 122-6249 Panel Assembly. The parts needed to convert a field machine to the new, easy access panels are listed in Chart 5.
Illustration 13.
Illustration 14.
The 149-1307 Panel Assembly installed.
The new panels are part of the 122-6442 Side Panel Group. Illustration 13 shows the inside and outside views of both new panel assemblies assembled. Illustration 14 shows the new 149-1307 Panel Assembly installed on a machine. These panels became available in production on machines equipped with air conditioning with the effectivity listed in Chart 6.
