Branson F42r - Page 321

6
-
43
42hW-201601
CHAPTER 6 HYDRAULIC SYSTEM
6
3015R(h)/3515R(h)/4015R(h)/F36R(h)/F42R(h) TRACTOR
NEUTRAL
+⭏ⴏ,
Sj5#便
+㨏ⴏ,
W
E
Sj4#俀
Sj5#便
Sj4#俀
A42W615B
In the HST pump operation process, it is almost impossible to set the swash plate at 0° exactly to keep the
neutralstate(nooilow).Also,itisimpossibleforthedrivertosettheangleoftheswashplateto0°forthe
neutral setting. To solve this problem, the neutral valve is installed to obtain the minimum range to keep the
neutral state.
When the angle of the swash plate is close to, but not exactly 0°, a small amount of oil is discharged to the
motor.Inthiscase,theneutralvalvedrainsthisoilthroughitsoricetopreventinternalpressurerisebeforeit
reaches the motor. This also prevents minute operation of the hydraulic motor.
HST
Pump
Check
valve
Charge relief valve
HST
Motor
Check
valve
(Forward)
(Reverse)