PAN GP-OIL 1W0592 - Caterpillar

planetary housing. With modification, a new tube can be installed on the outside of earlier transmissions to send supply oil to the main output shaft bearings and the shaft bearings in the front cover. Installation of this system prevents leakage (caused by oil pressure) through the liquid gasket material used on the surface between the transmission top cover and the main case.Parts Service
3T4974 (7251) and 3T4975 (7261) Transmission Housing Service Groups are now given as parts service replacements for the former 5L3313 (7251) and 7L5169 (7261) Transmission Housing Assemblies. If the former transmission housing is of the type without the outside lube tube, new housing assembly 3T4974 (7251) and 3T4975 (7261) can be used without modification; but make sure that 9F2247 Plug (1) is installed and lube hole (D) is open.
(2) If the former transmission housing is the new type (with the lube tube on the outside), remove 9F2247 Plug (1) and install 6P9677 Orifice Plug (2) and 9K2175 Plug (3). Other modifications to the replacement housing assembly are necessary; see the following procedure.Necessary Parts For Modification
Modification of either the 7251 or 7261 Marine Transmission is similar. The only difference is the drilling procedure for the rear housing assembly.It is not necessary to remove the top shaft, but the rear housing must be moved away from the rear of the main case.Modification Of 5L3313 Housing Assembly (7251) and 7L5169 Housing Assembly (7261)
(1) With a 7/16"-14 tap, make threads in existing oil supply hole (1) as shown. Put 9S3263 Thread Lock on the threads of 9K2175 Setscrew (2) and install it in oil supply hole (1). With a 60 (.25"0) drill, drill hole (3) in the lower part of the housing assembly as shown. This hole will release the oil pressure from against the O-ring seal. Hole (3) is shown as drilled directly under the center of the top shaft, but the hole can be off center if it is drilled without removal of the top shaft.Modification Of 7L5644 Manifold Assembly (7251 And 7261)
(1) With a 5/16"-18 tap, make threads in existing oil supply holes (1) and (2) as shown. Put 9S3263 Thread Lock on the threads of two 8B7179 Setscrews (3) and install them in holes (1) and (2). On the right side of 7L5644 Manifold Assembly (4) and at the approximate location shown, drill a 140 (.56"0) hole (5) and make threads with a 3/8"-18 pipe tap (on the 7251) or drill an 180 (.719"0) hole (5) and make threads with a 1/2"-14 pipe tap (on the 7261). Through this hole, a tube and extra parts will send an oil supply to the rear bearing.Modification Of 2N4344 Cover (7251)
(1) Remove 2N4344 Cover (1). Remove 5L9149 Oil Supply Tube (2), to keep metal drill chips from the output bearing. (2) Make drill fixture (3) as shown. Drill two 170 (.656"0) holes (A) and one 140 (.56"0) hole (B) at the dimensions shown. Grind a flat area on housing (4) at location (C). Install drill fixture (3) on