ARM GP-WINDOW WIPER 2644408 - Caterpillar

Table 1
Part Numbers    
Model     Description     Old Part Number     New Part Number    
D10R     Clutch Piston (Reverse)     112-4507     153-5479    
Clutch Piston (Forward) 112-4508     153-5480    
D11R (S/N: 9TR)     Clutch Piston (Reverse)     147-2695     156-2828    
Clutch Piston (Forward) 6Y-6212     156-2825    
992C, 992D, D11R (S/N: 8ZR)     Clutch Piston (Reverse)     7G-7742     175-2621    
Clutch Piston (Forward) 7G-7745     7G-7745    
990, 990 Series II, and 844     Clutch Piston (Reverse)     105-9269     175-2619    
Clutch Piston (Forward) 105-9268     175-2618    
992G and 854G     Clutch Piston (Reverse)     7G-7742     175-2621    
Clutch Piston (Forward) 123-4881     175-2620    
994 and 994D     Clutch Piston (Reverse)     9W-8898     173-9824    
Clutch Piston (Forward) 6Y-6212     156-2825    Modification Procedure
Transmissions may be adapted to the new slotted pistons by completing the following procedure.Note: These Modifications are recommended for all transmissions that are removed or disassembled. Also refer to the illustration in the material that was referenced. Replace the former illustration with Illustration 1.
Illustration 1 g01064454
(1) Added slots. (2) Opposite side of the Seal Ring Groove (C) (C) Dimension from the depth of the slot to the edge of the piston ... 2 0.25 mm (0.078 0.01 inch)
Illustration 2 g01065688
(3) Slots.
Cut slots (1) in six locations into the inner diameter and the outer diameter of the piston. Cut the slots in line with the slots for the reaction pins. Use a 12.7 mm (0.50 inch) cutter. Refer to Illustration 1 for the location and the depth of the slot.Note: Cut the slots into both the forward clutch piston and the reverse clutch piston.
Carefully deburr the slots.
Ensure that the opposite side of the seal groove (2) is not damaged during the procedure.