GEAR 8S9086 - Caterpillar

Power Shift Transmission
Transmission Hydraulic Controls (First Speed Forward, Engine Running)
(1) Oil filter. (2) Torque converter. (3) Body of relief valve for converter outlet. (4) Relief valve for converter outlet. (5) Oil cooler. (6) No. 5 clutch. (7) No. 4 clutch. (8) No. 6 clutch. (9) Oil pump. (10) Speed selection spool. (11) Load piston. (12) Transmission neutralizer valve. (13) Modulation relief valve. (14) Pressure differential valve. (15) Screen. (16) Ratio valve for torque converter inlet. (17) Direction selection spool. (18) No. 1 clutch. (19) No. 3 clutch. (20) No. 2 clutch. (21) Reservoir. (22) Flow control orifice. (A) Pressure tap for pump (on filter). (B) Pressure tap for converter outlet. (C) Pressure tap for transmission lubrication. (D) Pressure tap for converter inlet (P3). (E) Pressure tap for speed clutch (P1). (F) Pressure tap for direction clutch (P2).Location Of The Pressure Taps And Transmission Testing
(A) Oil pump (on filter).
(C) Transmission Lubrication.
(E) Speed clutch (P1). (F) Direction clutch (P2). (G) Plug for load piston (LP).
When tests and adjustments are made to the transmission, the parking brake must be OFF. To prevent movement of the machine and personal injury do the procedure that follows.
1. Lower the bucket to the ground.2. Put blocks in front of and behind the wheels.3. Install the anti-pivot link.4. Remove front and rear axle shafts (except for stall tests).5. Let only approved personnel on the machine and keep other personnel off of the machine and in clear view of the operator. All tests and adjustments must be made with the oil in the hydraulic control system at normal temperature of operation. Be sure the linkage adjustments are correct before tests are made.
Transmission Selector And Pressure Control Valve
(10) Speed selection spool. (11) Load piston. (13) Modulation relief valve. (14) Pressure differential valve. (16) Ratio valve for torque converter. (17) Direction selection spool. (23) Spacers. Transmission Oil Pump
Bench Test SpecificationsRotation is counterclockwise when seen from drive endType of pump: GearNumber of sections: OneFor test, use SAE 10W oil at 49°C (120°F)Output ... 83 liter/min (22 U.S. gpm) minimum At a speed of ... 1800 rpmAt a pressure of ... 2400 kPa (350 psi)Transmission Control Linkage Adjustments
Transmission control linkage adjustment should be made only with the engine OFF. Accidental transmission engagement and sudden machine movement could cause personal injury.
Direction Linkage (earlier models)
1. Put direction selection spool (1) in the NEUTRAL position.2. Make an adjustment to the length of rod (2) so that distance (A) from the center line of pin (4) to the face of cam (5) is 80.7 mm (3.18 in)3. Install the cable housing in neutralizer housing (6) so that distance (C) is 12.0 mm (.47 in).
Direction Control Linkage (at Transmission)
(1) Direction selection spool. (2) Rod. (3) Cable assembly. (4) Pin. (5) Cam. (6) Neutralizer housing. (A) 80.7 mm (3.18 in). (B) 14.0 mm (.55 in). (C) 12.0 mm (.47 in).4. Install cable assembly (3) in cam (5) so that distance (B) is 14.0 mm (.55 in).5. With direction selection spool (1) in the NEUTRAL position, loosen nuts