TIP AS-GP 5053984 - Caterpillar

Removal Procedure for Direct Drive Solenoid Valve
Personal injury can result from hydraulic oil pressure and hot oil.Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system.Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.
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, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Note: The transmission has been removed for photographic purposes.
Illustration 1 g00780351
Remove the floorplate.
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Disconnect wiring harness (2) .
Remove four caps (3) and bolts under each cap.
Remove transmission solenoid valve (4) .
Illustration 3 g00780356
Check the four O-rings (5) for wear. Replace the O-rings if the O-rings are in poor condition.