VALVE, ORBITROL 12550010 - Caterpillar

Hot oil and hot components can cause personal injury. Do not allow hot oil or hot components to contact skin.
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.
Refer to Operation and Maintenance Manual, "Access Doors and Covers" for the location of the service points.Clean the area around the differential drain plug and the area around the transmission drain plug. Refer to Illustration 1 for the location of the drain plugs. Clean the area around the oil level gauge/fill cap. Refer to Illustration 2 for the location of oil level gauge/fill cap.Operate the engine until the transmission oil and the differential oil are warm. Park the machine on a level surface and engage the parking brake. Lower the blade and apply slight down pressure to the blade. Stop the engine.Note: Drain the transmission case and drain the differential case while the oil is warm. This allows waste particles that are suspended in the oil to drain. As the oil cools, the waste particles will settle to the bottom of the case. The particles will not be removed by draining the oil and the particles will recirculate in the lubrication system with the new oil.
Illustration 1 g01298296
Bottom view
Remove transmission drain plug (1) and remove differential drain plug (2). Drain the oil into a suitable container.
Change the filter element and clean the screens. Refer to Operation and Maintenance Manual, "Transmission and Differential Oil Filter and Screens - Replace/Clean" for the proper procedure.
Clean the drain plugs and install the drain plugs.
Open the front left access door.
Illustration 2 g01299588
Fill the transmission case and the differential case with oil through oil level gauge/fill cap (3). Refer to the following topics:
Operation and Maintenance Manual, "Lubricant Viscosities"
Operation and Maintenance Manual, "Capacities (Refill)"
Remove transmission breather (4) and discard the transmission breather. Install a new transmission breather.
Start the engine and run the engine at low idle. Inspect the transmission and differential components for leaks.
Engage the transmission modulator control (inching pedal). Slowly operate the transmission in order to circulate the oil.
With the engine at low idle, maintain the oil level between the marks on the oil level gauge. If necessary, add oil through oil level gauge/fill cap (3).
Stop the engine.
Close the access door.