Splitting - GBA20 gearbox / Centre housing Special point (Fig. 12) On tractors fitted with creeper gears: - Remove screw (1). - Pull the pin (2) outwards in order to free the “D” finger of the fork. 53. Mark then disconnect: - the electrical connectors on the selector cover, the control unit (Dynashift – reverse shuttle) and the right-hand hydraulic cover
Servicing on the left-hand side of the tractor Mark then disconnect: - the harness of the fuel gauge on the tank - the gas oil feed and return hoses on the engine (block ports immediately) - the vent hose on the tank
Fig. 12
54. Drain the tank (if necessary) and remove it. 55. Disconnect the transmission lubricating pipe or hose located at the front left-hand side of the gearbox.
Servicing under the cab 56. Mark then disconnect: - the right- and left-hand brake cables (block ports immediately) - the steering hose of the trailer brake valve, if fitted (block ports immediately) - the handbrake cable - the speed sensor connectors (PTO and ground speed).
Fig. 13
Servicing at the rear of the tractor 57. Mark and disconnect cables: - of the auxiliary spool valves (optional) - of the power take-off (all versions) 58. Mark and disconnect the connectors: - on the electrohydraulic spool valves - on the lift control valve - on the power take-off - on the effort sensors
Preparing for disassembling
61. Position a fixed stand at the back of the gearbox (Fig. 15). 62. Position a mobile stand at the front of the centre housing and another at the back (Fig. 15). 63. Separate the cab from the supports on the rear right- and left-hand sides (fixed or suspended cab versions – see chapter 12). 64. Using two straps with hooks, gently lift the cab with the rear pillars (Fig. 15). 65. Fit a wooden chock temporarily between the cab and the pillars.
59. Cancel the front axle oscillation (all versions) by sliding a suitable chock in either side of the support (1) (Fig. 13). 60. Chock the front wheels.
Massey Ferguson 6400 - Issue 1
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02C01.11