Hydrostatic Transmission (Hst) Neutral Adjustment - New Holland Boomer 47 Operator's Manual

Hydrostatic transmission (HST) neutral adjustment

Checking HST return to "NEUTRAL"
1. Place range gear in "LOW" range and engine speed at
high idle position.
2. Drive tractor in forward and reverse, remove foot from
HST pedal. Tractor should stop and rear wheels should
not rotate when pedals are at "NEUTRAL" position.
3. If rear wheels rotate when HST pedals are in the "NEU-
TRAL" position , the HST control linkage needs to be
adjusted.
Adjusting "NEUTRAL" setting of HST control linkage
1. Park the tractor on level hard surface, with the engine
turned off.
NOTE: Before raising the rear wheels, install chocks between
the front axle and engine frame to prevent the front of the
tractor from oscillating side to side.
2. Raise the rear tires off the ground and support axles,
with safety stands.
3. Place the 4WD control lever in the "2WD" position.
4. The forward and reverse pedals should be at the same
height. Adjust pedal height by loosening bolt (1) and
rotating shaft (2) as needed. After height adjustment
is obtained, hold shaft (2) in place when tightening bolt
(1).
5. After pedal height adjustment, is completed, check that
HST neutral switch (3) is depressed when the pedals
are in the "NEUTRAL" position. If switch is not de-
pressed, loosen bolts (4) and adjust position of switch
so that switch is depressed. Tighten bolts after adjust-
ment is completed.
6. Start the tractor, place the range gear in "LOW" range
and engine speed at high idle.
7. Depress both forward and reverse pedals separately.
Release pedals and check if rear wheels rotate when
pedals return to the "NEUTRAL" position.
8. If rear wheels rotate when pedals are at the "NEU-
TRAL" position, adjust HST linkage by loosening jam
nuts (5) and rotating rod (6) until wheels do not rotate.
Tighten jam nuts after adjustment is completed.
9. Remove tractor from safety stands, when adjustment
is completed.
7 - MAINTENANCE
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