VALVE GP-PUMP CONTROL 3485974 - Caterpillar

Hot oil and hot components can cause personal injury. Do not allow hot oil or hot components to contact the 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, "Caterpillar Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Illustration 1 g02102533
(1) Ecology drain plate
Remove ecology drain plates (1) from the bottom of the drop box and the planetary gear case.
Allow the oil to drain into a suitable container.
Illustration 2 g02102534
Typical example of a TH31-E61 and TH35-E81 Petroleum Transmission with drop box
(2) Magnetic plug
(3) Filler tube and dipstick
Illustration 3 g02088997
Typical example of a TH31-E61 and TH35-E81 Petroleum Transmission with drop box
(2) Magnetic plug
(4) Suction screen
(5) Magnetic filter
(6) Access plate with three M8x1 bolts
Remove magnetic drain plugs (2) from the right side of the planetary gear housing and from the bottom of the drop box. Refer to Illustrations 2 and 3 for the locations of the magnetic plugs. Inspect for large particles of debris. An excessive amount of debris may be an indication of possible failure. Discolored oil or oil with an odor requires a careful analysis of S O S results. If large particles are found, consult your Caterpillar dealer for further analysis and additional guidance.
After the oil has drained from the transmission case, clean the drain plug before reinstalling magnetic drain plug (2). Torque the magnetic plug on the right side of the planetary gear housing to 90 15 N m (66 11 lb ft) and torque the magnetic plug on the bottom of the drop box to 105 10 N m (77 7 lb ft).
Remove the 3 bolts for the access plate (6).
Remove suction screen (4). Remove magnetic filter (5). Note: Additional oil may drain from the oil pan when the cover is removed. Ensure that a suitable container is in place in order to capture any oil that may drain from the torque converter housing.
Inspect suction screen (4) and magnetic filter (5) for large particles of debris. An excessive amount of debris may be an indication of possible failure. Discolored oil or oil with an odor requires a careful analysis of S O S results. If large particles are found, consult your Caterpillar dealer for further analysis and additional guidance.
Do not drop or rap the magnets against any hard objects. The magnets are very brittle. Replace broken magnets or damaged screens.
Wash the suction screen and the magnetic filter in clean, nonflammable solvent. Clean the magnets with a cloth or a stiff bristle brush.
Inspect the condition of the O-ring seal in the access plate. If the seal is damaged, replace the seal.
Install magnetic filter (5), screen (4) and access plate (6). Tighten the three bolts for the access plate to 55 10