Accumulator Precharge

The accumulator precharge should be matched to the specific header and feeder house lift cylinders on a combine. When changing heads during a harvest season, there is no need to change the pre charge. If operating with different heads, the precharge should be set for the one with the lowest precharge.

NOTE: See the following chart to determine if the precharging needs to be changed. The factory precharge setting is 1200 psi.

To adjust accumulator precharge, see your John Deere dealer.

HX,AG,SF7191 -19-04MAR99-1/2

Recommended Accumulator Pressure kPa (psi)
Header Model 9450 Combines 9550 and 9650 Combines With Single Reduction Final Drives 9650 With Heavy Duty Final Drives
912 BPU 5653 (820) 4378 (635) 3516 (510)
914 BPU 6308 (915) 4895 (710) 3930 (570)
915 6653 (965) 5171 (750) 4137 (600)
918 7653 (1110) 5929 (860) 4757 (690)
920 8274 (1200) 6446 (935) 5171 (750)
922 8963 (1300) 6963 (1010) 5584 (810)
925 9928 (1440) 7756 (1125) 6205 (900)
492 7300 (1059) 5689 (825) a
493 7300 (1059) 5689 (825) a
930 a 9032 (1310) 7239 (1050)
444 7653 (1110) 5964 (865) a
494 7653 (1110) 5964 (865) a
592 7653 (1110) 5964 (865) a
594 8298 (1204) 6446 (935) 5170 (750)
643 8963 (1300) 6963 (1010) 5584 (810)
693 8963 (1300) 6963 (1010) 5584 (810)
644 10928 (1585) 8515 (1235) 6826 (990)
694 10928 (1585) 8515 (1235) 6826 (990)
645 11032 (1600) 8618 (1250) 6895 (1000)
843 a 9963 (1445) 7963 (1155)
890 a 9963 (1445) 7963 (1155)
892 a 9767 (1417) 7807 (1132)
893 a 9963 (1445) 7963 (1155)
844 a 10825 (1570) 8653 (1255)
894 a 10825 (1570) 8653 (1255)
1290 a a 9880 (1433)
1291 a a 10595 (1537)
1243 a a 11032 (1600)
1293 a a 11032 (1600)
454 9894 (1435) 7722 (1120) a
653 11583 (1680) 9032 (1310) 7239 (1050)
654 12307 (1785) 9584 (1390) 7653 (1110)
655 13272 (1925) 10342 (1500) 8274 (1200)
853 a 11204 (1625) 8963 (1300)
aNot Recommended

 

HX,AG,SF7191 -19-04MAR99-2/2