7.7 Possible failures in front power take-off shaft and guidelines for troubleshooting

Low oil pressure in transmission hydraulic system

Low oil pressure at valve output to PTO friction coupling due to excessive internal leakage Friction coupling operating trouble due to piston deadlock or wear and tear of frictional disks Adjust pressure reducing valve of transmission hydraulic system or correct other troubles in the transmission hydraulic system Check pressure of oil running in PTO friction coupling, replace friction coupling O-rings if necessary Rinse friction coupling components in pure diesel fuel, replace frictional disks if necessary

When PTO brake is engaged the end extension is still rotating

Oil pressure loss at valve input or at output leading to PTO brake Check pressure at control valve input, in case there is no pressure correct the trouble of transmission hydraulic system. In case there is no pressure at valve output to PTO brake replace the control valve

Low oil pressure at output leading to PTO brake due to excessive internal leakage Brake operating trouble due to piston deadlock or wear and tear of frictional disks Check pressure of oil running in PTO brake, replace friction coupling O-rings if necessary

Rinse brake components in pure diesel fuel, replace frictional disks if necessary

Bent fracture of PTO shaft end extension

Heavy bending load on shaft end extension from the implement coupled drive (out-of-limit angles of cardan shaft and etc.,) Eliminate break of coupling requirements. Correct troubles in the machine, replace PTO shaft end extension

Twisting of splines (teeth) of PTO shaft end extension

Shock stress generated by implement coupled that is transmitted to the PTO shaft end extension Check availability and operability of safety elements of the implement coupled (torque-limiting clutch, shear bolt) and correct the trouble, replace PTO shaft end extension

Application of PTO shaft end type coordinated by horsepower capacity with implement coupled drive Install PTO shaft end of horsepower capacity required by the implement drive (from the set supplied with SPTA)

7.7 Possible failures in front power take-off shaft and guidelines for troubleshooting

List of possible failures of front power take-off shaft and guidelines for troubleshooting are shown in Table 7.7. Table 7.7

Failure, external manifestations,

Troubleshooting

cause

Front PTO shaft can not be engaged and its end extension does not rotate When the FPTO is engaged in- Comply with instructions of subsection 7.4 “Possi-