VALVE GP-STEERING 9J9330 - Caterpillar

Pressurized system: Hot oil can cause serious burns. To open plug, stop engine, wait until axle is cool. Then loosen plug slowly to relieve the pressure.
Always use a designated pump for oil sampling, and use a separate designated pump for coolant sampling. Using the same pump for both types of samples may contaminate the samples that are being drawn. This contaminate may cause a false analysis and an incorrect interpretation that could lead to concerns by both dealers and customers.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products.Dispose of all fluids according to local regulations and mandates.
Operate the machine for a few minutes before obtaining the oil sample. This action will thoroughly mix the oil for a more accurate sample.
Illustration 1 g03029057
View of front side of front differential.
Front differential filler plug.
Illustration 2 g03029060
View of front side of rear differential.
Rear differential filler plug.
Illustration 3 g00760182
Final Drive Filler Plug
The differential and final drives are not equipped with sampling valves. Obtaining an oil sample will require the use of a vacuum pump or equivalent in order to extract the oil from the component. Extract the oil through the filler openings on the differential and final drives.Note: This procedure requires a sample for each final drive and each differential. There will be a total of three samples per axle and six samples for this procedure in total. Make sure that you properly record the location of each oil sample.Reference: For more information, refer to Special Publication, SEBU6250, "Caterpillar Machine Fluids Recommendations" and Special Publication, PEHP6001, "How To Take A Good Oil Sample".