PUMP GP-HYD 0R9333 - Caterpillar

Two identical clutch assemblies are mounted on the clutch shaft. One is used to Reel-In, the other for Reel-Out. Each clutch contains five friction discs (12) splined to the bevel gears and five steel discs (13) with tangs to engage the slotted the clutch housing. The clutch housing is splined to the clutch shaft.When the operator shifts his control handle to operate the winch, hydraulic pressure is directed through a passage in the clutch shaft to the appropriate clutch housing. The oil pressure then acts on the clutch piston to compress the steel and friction discs thereby locking the bevel gear to the clutch shaft and winch gear train.When the operator returns the controls to "Brake-On", the clutch application oil will be exhausted through the control valve and through a small check valve installed in the clutch housing. The piston return springs (3) will push the piston away from the clutch discs and permit the bevel gear to turn free of the clutch shaft which is now locked by the spring applied brake. Removal
Right hand or left hand clutch removal may be accomplished with a winch mounted to the tractor. However, if both clutch assemblies are to be inspected for repair and/or replacement, it is advantageous to remove the winch from the tractor.The bevel pinion carrier and pump assembly is removed from the front of the winch and, after removal of the brake assembly, the complete clutch and bevel gear shaft assembly is removed through the brake opening on the right side of the winch.Refer to Clutch Shaft Group, for removal and disassembly of the clutch and bevel gear shaft assembly.Disassembly
Remove the pressure plate retaining ring(s) (7) using slight pressure to compress the wave springs, if so equipped.Remove the pressure plate (10), clutch friction discs (12), steel discs (13), and the wave springs (18) as required.Inspect friction discs for wear and flatness. Original disc thickness is .138-.148 in. (3.5-3.8 mm). Oil groove depth on new discs is .015 in (.38 mm) minimum. Replace friction discs if the oil groove is .005 in. (.13 mm) or less, disc is not flat, or friction material is worn unevenly.Inspect steel discs for scoring and warpage, PA55/PA56 discs are flat and .093 in. (2.36 mm) thick. Replace steel discs if they are not flat beyond .015 in. (.4 mm), heat discolored, or show signs of friction material transfer. Using a suitable press or two C-clamps, depress spring retainer (8) and remove retaining ring (6) and clutch spring retainer (8).Remove the eight clutch piston return springs (3). During the rebuild of clutch assemblies, it is recommended to replace all eight springs. Minimum spring free length is 1.16 in. (29.5 mm) for springs in slotted housings.Turn the clutch housing over and tap on bench top to remove clutch piston (14). Remove two plugs (1) to aid in piston removal. Inspect piston for wear or damage.Remove O-rings and back-up rings from the piston. Replace O-rings and/or back-up rings upon reassembly. Remove the check valve seat