Distance (odometer), service hours or calendar time, whichever occurs first, can be used to determine the maintenance intervals. Frequency of fluid and filter changes are determined by the severity of the transmission application. More frequent changes are necessary when high levels of contamination, overheating, or SOS oil analysis indicates that the transmission oil has been contaminated. Contamination may include a viscosity change, a strong odor, or a discolored black appearance.
Note: During a system failure of internal components, the power train generates abrasive debris that circulates throughout the system. The debris can cause the valves, the power train, pumps, and actuators to suffer repeat failures. Thoroughly clean debris from the system after a component failure and replace the transmission oil cooler core in order to prevent repeat failures. Refer to Operation and Maintenance Manual, SEBU6250, "Caterpillar Machine Fluids Recommendations" for information on improving the durability of machine components and for additional fluid information.
When a maintenance interval has been reached, all of the specified maintenance for that particular interval must be performed.
Application Severity Definitions
Severe Application vehicles operate both on and off highway. Typical applications are dump trucks, transit mixers, refuse trucks, all-wheel drive public utility trucks, snow removal, yard spotters, and concrete pumpers. Heavy equipment transport and specialty PTO applications are also considered severe applications.
General Application vehicles operate exclusively on paved or improved roads. Typical applications are line haul, pickup and delivery, beverage delivery, public service dump, emergency vehicles, and recreational vehicles with living accommodations.
Note: #1. Caterpillar recommends the CX35 main transmission filter be changed after the initial 200 hours of operations.
#2. Always inspect and clean the magnetic screen with each oil change.
#3. The breather needs to be cleaned with a petroleum-based solvent as necessary based on the operating environment.
| SEVERE APPLICATIONS Full Synthetic ATF Meeting Caterpillar AT-1 or TES 295 Specifications (1) |
||
|---|---|---|
| Fluid Change Intervals | Main Filter |
Magnetic Screen |
| 75,000 miles (2) (120,000 km) 3,000 hours 36 months |
75, 000 miles (120,000 km) 1,500 hours 36 months |
75,000 miles (120,000 km) 3,000 hours 36 months |
| ( 1 ) | With acceptable SOS oil analysis results every 15,000 miles or 600 hours. |
| ( 2 ) | Factory test oil is non-synthetic. Residual oil in the transmission will dilute the first use of synthetic oils. Caterpillar recommends a reduced oil change scheduled for the first installation of synthetic oils. |
| GENERAL APPLICATIONS Non-Synthetic ATF Specification (TES 389) |
||
|---|---|---|
| Fluid Change Intervals | Main Filter |
Magnetic Screen |
| 25,000 miles (40,000 km) 1000 hours 12 months |
25,000 miles (40,000 km) 1000 hours 12 months |
25,000 miles (40,000 km) 1000 hours 12 months |
| GENERAL APPLICATIONS Full Synthetic ATF Meeting Caterpillar AT-1 or TES 295 Specifications (1) |
||
| 150,000 miles (2) (240,000 km) 4,000 hours 48 months |
75, 000 miles (120,000 km) 1,500 hours 36 months |
75,000 miles (120,000 km) 3,000 hours 36 months |
| ( 1 ) | With acceptable SOS oil analysis results every 30,000 miles or 1200 hours. |
| ( 2 ) | Factory test oil is non-synthetic. Residual oil in the transmission will dilute the first use of synthetic oils. Caterpillar recommends a reduced oil change scheduled for the first installation of synthetic oils. |
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S·O·S Information
S·O·S Services is a highly recommended process for Caterpillar customers to use in order to minimize owning and operating costs. Customers provide oil samples, coolant samples, and other vehicle information. The dealer uses the data in order to provide the customer with recommendations for management of the equipment. In addition, S·O·S Services can help determine the cause of an existing product problem.
Refer to Special Publication, SEBU6250, "Caterpillar Machine Fluid Recommendations" for detailed information concerning S·O·S Services.
Refer to the OMM for a specific sampling location and a service hour maintenance interval for your application. Illustration (9) item (1).
Consult your Caterpillar dealer for complete information and assistance in establishing an S·O·S program for your equipment.