LEVER-SHORT 8B5814 - Caterpillar

Illustration 4 g01325173
Transmission Shafts (8) Input shaft (9) Intermediate shaft (10) Output shaft (11) Transfer gear shaftThe following shafts contain clutch packs and planetary clutch packs that control the FORWARD speeds:
Input shaft (8)
Intermediate shaft (9)
Output shaft (10)
Illustration 5 g01325179
Transmission Shafts (2) Gear (4) Gear (8) Input shaft (9) Intermediate shaft (10) Output shaft (11) Transfer gear shaft (12) Reverse shaftNote: Gear (4) meshes only with gear (2). The configuration of the five transmission shafts in Illustration 5 is only for illustrative purposes.The following shafts contain clutch packs and planetary clutch packs that control the REVERSE speeds:
Input shaft (8)
Intermediate shaft (9)
Output shaft (10)
Reverse shaft (12) ReferenceSee Systems Operation/Testing and Adjusting, "Transmission Power Flow" for additional information.Oil Flow and Rotational Power Flow
Regular Clutch Pack
Illustration 6 g01335097
(1) Clutch pack (13) Gear (14) Spring (15) Clutch lubrication passage (16) Friction discs (17) Clutch plates (18) Balance piston (19) Piston (20) Oil passage (21) Oil passage (22) CylinderOil flows from the modulating valve through oil passage (20) in the transmission shaft. Oil fills the chamber behind piston (19) .Piston (19) is used for the following functions:
The piston will compress clutch plates (17) against friction discs (16) .
The piston will control lube flow to the friction discs and the clutch plates.Note: Illustration 6 shows the clutch in the disengaged position.Clutch Engagement
As pressure builds up behind the piston, the piston will start to move toward the friction discs and clutch plates. This will eventually overcome the spring and the lubrication oil pressure in front of the piston. At maximum pressure, the piston will completely compress the friction discs and clutch plates.The clutch plates are engaged to cylinder (22) by the use of spline teeth. Because the cylinder is rotating with the transmission shaft, the clutch plates will cause the friction discs to rotate.Because the friction discs are engaged to gear (13) by the use of spline teeth, the gear will rotate. Consequently, rotational power flow will be transfered through the transmission shaft to the gear.Balance Piston Operation
The piston will block clutch lubrication passage (15) when the clutch is disengaged. This will prevent viscous friction between the lubrication oil and the rotating friction discs and clutch plates. This friction could cause increased load to the engine.Centrifugal pressure will build up behind the piston when the transmission shaft is turning and the clutch is disengaged. This will cause the piston to move toward the friction discs and the clutch plates. This movement is sufficient enough to slightly engage the clutch. If the piston is not properly retracted away from the friction discs and clutch plates, excess heat could build up in the hydraulic oil system. Also, unnecessary wear to the friction discs and clutch plates could occur. Consequently, it is necessary to assist spring (14) by using lubrication oil to help balance the centrifugal pressure and prevent piston movement when the clutch is disengaged.The piston contains oil holes in order to allow lubrication oil to flow in front of the piston. The lubrication oil flows from oil passage (21) through