1998/04/27 Caterpillar


Gear Box Dipstick Is Now A Plug {4350}

Usage:




914G (7ZM1-Up, 9WM1-Up) Wheel Loaders IT14G (8ZM1-Up, 1WN1-Up) Intergrated Toolcarriers.

Reference: SEBU6868, Operation & Maintenance Manual, 914G Wheel Loader, Maintenance Section, Page 111, "Every 2000 Service Hours or 1 Year".

Reference: SEBU6869, Operation and Maintenance Manual, IT14G Integrated Toolcarrier, Maintenance Section, Page 111 "Every 2000 Service Hours or 1 Year".

Reference: SEBP2343, August, 1995, Parts Manual, Pages 131, 132.

Reference: SEBP2344, August, 1995, Parts Manual, Pages 125, 126, 127, 128.

Reference: Service Magazine, SEPD0400, January 19, 1998, Page 24, "Correction to Lubricant Viscosities and Refill Capacities Charts".


Illustration 1.
Former hydrostatic drive group power unit dipstick.

The information in the above manuals concernring the rear differential dipstick is incorrect.

In Step 3 on page 111 of both operation and maintenance manuals, the manuals incorrectly identify the hydrostatic power unit drive group drain plug as the rear differential drain plug. In Step 5, the manuals incorrectly identify the former hydrostatic power unit drive group gauge assembly as the rear differential gauge assembly.

On the pages noted above, the parts manuals list incorrect parts.

Changes were made to the hydrostatic power unit drive group going back to first production. The two 8T-4197 Bolts (1), 121-2021 Tube Assembly (2), and 128-5512 Gauge Assembly (3) were never used in production. The table and illustration above show the former parts.


Illustration 2.
Correct hydrostatic power unit drive group Fill/Level Hole.

Three parts were added to the hydrostatic power unit drive group. The 130-8187 Block (1), two 8T-6912 Bolts (2), and one 1B-5174 Pipe Plug (3) were added to this unit. These changes are effective back to first production. The table and illustration above show the correct parts.


Illustration 3.
The hydrostatic power unit drive group.

Above is a view of the hydrostatic power unit drive group sump. The 130-8187 Block is attached on the back side of cover housing (2) and in front of support assembly (3). Axle (4) is behind support assembly (3).


Illustration 4.
The hydrostatic power unit drive group fill/level hole & plug.

Block (1) and Pipe Plug (3) are shown above installed. The block is attached to the cover housing (4) by two 8T-6912 Bolts, (2).

The following procedure is the correct differential oil change procedure.

NOTE: When changing the differential lubricants on the 914G Wheel Loaders and the IT14G Integrated Toolcarriers, drain and fill both the rear differential and the hydrostatic power unit drive group.

The hydrostatic power unit drive group sump is also known as the drop box or gearbox. In the remaining parts of this article, the hydrostatic power unit drive group sump will be refered to as the gearbox. Gearbox is its designation in the Refill Capacities table. See the Service Magazine article referenced above.

NOTE: The gearbox and the rear differential are two separate items. The gearbox and the rear differential are not lubricated from a common sump.

For the following procedures, refer to the Service Magazine article referenced above for the correct type of oil and the correct quantity of oil for the specific component.

Every 2000 Service Hours Or 1 Year

You must read and understand the warnings and instructions contained in the Safety Section of the Operation & Maintenance Manuals listed above before performing any operation or maintenance procedure.

Differentials

Changing The Oil

Wipe covers and surfaces around the openings before checking the oil level or adding oil.

The Front Differential and Fixed Rear Axle Differential


Illustration 5.
Differential magnetic plug.

1. Remove magnetic plug (1). Allow the oil to drain into a suitable container.

2. Clean and install magnetic plug (1).

3. Remove and clean gauge assembly (2).

4. Add 0.5 L (.5 qt) of 1U-9891 Hydraulic Oil Additive to the axle.

5. Fill the axle with oil until the oil level registers between the ADD and FULL marks on the gauge assembly.

NOTE: To get an accurate reading, the oil gauge assembly must be installed and tightened finger tight and then removed.

Refer to the Lubricant Viscosities and Refill Capacities Tables for the correct quantity needed.

6. Refer to 1E0279X Tightening Specification. Tighten gauge assembly (2) to a torque of 45 ± 6 N·m (33.1 ± 4.4 lb ft).

The Rear Differential, Oscillating Axle Arrangement


Illustration 6.
Rear differential magnetic plug and gauge assembly.

1. Remove magnetic plug (1). Allow the oil to drain into a suitable container.

2. Clean and install magnetic plug (1).

3. Remove and clean gauge assembly (2).

4. Add 0.5 L (.5 qt) of 1U-9891 Hydraulic Oil Additive to the axle.

5. Fill the axle with oil until the oil level registers between the ADD and FULL marks on the gauge assembly. Refer to the Lubricant Viscosities and Refill Capacities Tables for the correct quantity needed.

6. Refer to 1E0279X Tightening Specification. Install gauge assembly (2) and tighten to a torque of 45 ± 6 N·m (33.1 ± 4.4 lb ft).

The Gearbox


Illustration 7.
The gearbox magnetic plug.

1. Remove magnetic plug (1). Allow the oil to drain into a suitable container.

2. Clean and install magnetic plug (1).

Refer to Illustration 4, item (3), for the location of the gearbox fill/level plug.


Illustration 8.
Gearbox fill/level plug.

3. Remove and clean pipe plug (1).

4. Fill the sump with oil as specified in the Lubricant Viscosities and Refill Capacities Chart. Refer to the January 19, 1998, Service Magazine article referenced at the start of the article for the correct quantity of oil required.

6. Refer to 1E0279A NPTF Tightening Specification. Install pipe plug (1) and tighten to a torque of 75 N·m (55.2 lb ft). Do not use thread sealant.

Caterpillar Information System:

1998/04/27 Revised Walk-Around Inspection Chart, SELU7039-01, Now Available {0374,7000}
1998/04/27 New Lubrication And Maintenance Interval Decal, SEEU7039, Now Available {0374,0653,7000}
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1998/05/04 Field Installation Of The CD Player{7338}
1998/05/04 New Pumps For C-Series Backhoe Loaders{5070}
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1998/05/04 Procedure For Adjusting Hood Side Panels{7251}
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