mxu 500 irs efi Manuale-dofficina : Pagina 248

          13. DRIVE TRAIN                                                                        MXU 500 IRS


 SERVICE INFORMATION
 GENERAL INSTRUCTIONS
 · Too little backlash is extremely destructive to the gear teeth. If a test ride following reassembly
   indicates this condition, stop riding immediately to minimize gear damage.
 · Stop riding immediately if broken gear teeth are suspected. This condition could result in the
   shaft drive assembly locking up, causing loss of control of the machine and possible injury to the
   rider.
 · An apparent oil leak on a new or nearly new machine may be the result of a rust-preventative
   coating or excessive seal lubrication.
 · Always clean the machine and recheck the suspected location of an apparent leakage.



 TORQUE VALUES
 Front drive gear case mounting bolt    4 kgf-m (40 Nm, 29 lbf-ft)
 Front propeller shaft bolt             4.5 kgf-m (45 N-m, 32.4 lbf-ft)
 Shifting fork shaft plug               1.5 kgf-m (15 N-m, 11 lbf-ft) Apply threebond: 1215
 Front drive gear case bolt             2.3 kgf-m (23 N-m, 16.5 lbf-ft) Apply threebond: 1215
 2WD/4WD shift motor mounting bolt (M8) 2.3 kgf-m (23 N-m, 16.5 lbf-ft) Apply threebond: 1215
 2WD/4WD shift motor mounting bolt (M6) 1.2 kgf-m (12 N-m, 8.5 lbf-ft)
 Rear drive gear case mounting nut      5.5 kgf-m (55 Nm, 40 lbf-ft)
 Rear drive gear case bolt (M10)        5 kgf-m (49 N-m, 36 lbf-ft) Apply threebond: 1215
 Rear drive gear case bolt (M8)         2.5 kgf-m (25 N-m, 19 lbf-ft) Apply threebond: 1215

 SPECIAL TOOLS
 A120E00014
 Bearing puller                   A120E00037
 Joint yoke remover               A120F00016
 Drive shaft puller               A120F00017
 Yoke bearing puller              A120F00018
 Pinion gear puller               A120F00026
 Bearing lock nut wrench          A120F00020/25

 TROUBLESHOOTING
 1. A pronounced hesitation movement during acceleration, deceleration, or sustained speed.
    (This must not be confused with engine surging or transmission characteristics.)
 2. A "rolling rumble" noticeable at low speed; a high-pitched whine from front drive
    component or area.
 3. A locked-up condition of the shaft drive train mechanism, no power transmitted from the
    engine to the front and /or rear wheel.
 · Bearing damage
 · Improper backlash
 · Gear tooth damage
 · Broken propeller shaft
 · Broken gear teeth
 · Seizure due to lack of lubrication
 · Small foreign objects lodged between the moving parts.


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