JLG TF6-42 Service Manual - Manuale (Pagina 650)

T12000 ID 04/99 I-ii
6. OPERATION OF THE TRANSMISSION
6.1 THE TRANSMISSION ASSEMBLY ......................................................................................... 6-1
6.1.1 The converter, pump drive section and pressure regulating valve ................................. 6-2
6.1.2 The input shaft and directional clutches ......................................................................... 6-3
6.1.3 The range clutches ........................................................................................................ 6-4
6.1.4 The output section ......................................................................................................... 6-4
6.1.5 The transmission controls (refer to hydraulic diagram) .................................................. 6-5
6.2 ELECTRIC SOLENOID CONTROLS ...................................................................................... 6-6
6.2.1 3-Speed transmission .................................................................................................. 6-6
6.2.2 4-speed transmission ................................................................................................... 6-6
6.2.2.1 Standard 4-speed transmission ......................................................................... 6-6
6.2.2.2 Alternative 4-speed transmission, ...................................................................... 6-7
6.2.3 6-Speed transmission .................................................................................................... 6-7
6.3 POWERFLOWS, ACTIVATED SOLENOIDS AND HYDRAULIC CIRCUIT ............................. 6-8
6.3.1 3-Speed transmission .................................................................................................. 6-8
6.3.1.1 Neutral and 3rd clutch engaged ........................................................................ 6-8
6.3.1.2 Forward 1st speed ........................................................................................... 6-10
6.3.1.3 Forward 2nd speed .......................................................................................... 6-12
6.3.1.4 Forward 3rd speed .......................................................................................... 6-14
6.3.1.5 Reverse 1st speed ........................................................................................... 6-16
6.3.2 4-Speed transmission ................................................................................................ 6-18
6.3.2.1 Standard 4-speed transmission ....................................................................... 6-18
6.3.2.1.1 Neutral and 3rd clutch engaged ......................................................... 6-18
6.3.2.1.2 Forward 1st speed .............................................................................. 6-19
6.3.2.1.3 Forward 2nd speed ............................................................................ 6-21
6.3.2.1.4 Forward 3rd speed ............................................................................. 6-24
6.3.2.1.5 Forward 4th speed ............................................................................. 6-26
6.3.2.1.6 Reverse 1st speed ............................................................................. 6-28
6.3.2.2 Alternative 4-speed transmission ..................................................................... 6-30
6.3.2.2.1 Neutral and 3rd clutch engaged ......................................................... 6-30
6.3.2.2.2 Forward 1st speed .............................................................................. 6-32
6.3.2.2.3 Forward 2nd speed ............................................................................ 6-34
6.3.2.2.4 Forward 3rd speed ............................................................................. 6-36
6.3.2.2.5 Forward 4th speed ............................................................................. 6-38
6.3.2.2.6 Reverse 1st speed ............................................................................. 6-40
6.3.3 6-Speed transmission ................................................................................................ 6-42
6.3.3. 1Neutral and 3rd clutch engaged ................................................................................ 6-42
6.3.3.2 Forward 1st speed ........................................................................................... 6-44
6.3.3.3 Forward 2nd speed .......................................................................................... 6-46
6.3.3.5 Forward 4th speed ........................................................................................... 6-50
6.3.3.6 Forward 5th speed ........................................................................................... 6-52
6.3.3.7 Forward 6th speed ........................................................................................... 6-54
6.3.3.8 Reverse 1st speed ........................................................................................... 6-56
6.4 GEAR AND CLUTCH LAY-OUT (3-SPEED) .......................................................................... 6-58
6.4 GEAR AND CLUTCH LAY-OUT (4-SPEED AND 6-SPEED) ................................................. 6-59
7. TROUBLESHOOTING GUIDE FOR THE T12000 TRANSMISSION
7.1 T12000 TRANSMISSION ........................................................................................................ 7-1
7.2 TROUBLESHOOTING PROCEDURES .................................................................................. 7-1
7.2.1 Stall Test ......................................................................................................................... 7-1
7.2.2 Transmission pressure checks ....................................................................................... 7-2
7.2.3 Mechanical and electrical checks .................................................................................. 7-2
7.2.4 Hydraulic checks ............................................................................................................ 7-2