TM 5-3895-356-14&P
HYDRODSTATIC DRIVE OPERATION
The hydrostatic drive consists of a
ting is determined which will
2. Adjust spray bar length to
variable output pump driven by the
prevent jerky forward truck motion
previously determined length.
truck P.T 0 which m turn drives the
and still supply adequate power
3. Engage truck power take
distributor asphalt pump with a
and speed for the terrain.
off.
hydrostatic motor. Thus once the
7. Now, while driving the
4. Place quadrant control m
correct ratio between ground
distributor forward at the speed (F
"Circulate in Bar" position ready to
speed and pump flow rate Is
P.M.) previously determined from
spray NOTE Prior to placing
established
for
a
given
the computator, push the hydraulic
quadrant control in "Circulate in
transmission setting, the truck
control knob down until the asphalt
Bar" position decrease pump flow
ground speed may be varied
pump flow rate (G.P M ) is equal to
rate, if necessary, to a maximum of
without affecting the application
the gallonage determined from the
160 G P.M.
by raising the
rate.
computator.
hydraulic control knob.
8. The control knob should
5. Engage truck transmission
be held in this position by turning
in gears previously determined for
the fine control tube up until it is
proper application speed.
Dry run establishment of correct
against the bottom of the hydraulic
6 Bring truck speed up until pump
ratio between pump flow rate
control knob Then lock the tube in
flow rate is at least 3/4 of the
and ground speed
place with the brass lock ring.
original determined flow rate Upon
1. Determine
from
the
9. Now that a dry run has
reaching
starting
point,
if
computator the correct ground
been completed you may wish to
necessary push hydraulic control
speed (F P.M ) and pump flow rate
record the truck gear setting, spray
knob down against stop and turn
(G.P M ) for the desired spray bar
bar length, application rate and
on spray bar.
length (FT ) and application rate
engine tachometer R P M so the
7. Once started the operator
(GAL /SQ YD ).
application rate can be duplicated
may drive up to a speed at which
2. Place quadrant control
in the future by merely using the
the pump flow rate (GPM) is 1 1/2
lever in "Circulate in Tank"
truck
engine
tachometer
to
times greater or down to a speed
position.
establish the proper pump flow rate
at which the flow rate (G P M ) Is
3. Pull hydraulic control knob
An "Etnyre Shot Guide" has been
3/4 of the original determined flow
to upper most position (see
provided for this purpose Also see
(G P M) Above the high speed
General Identification Page).
section on "Recording Settings
excessive fogging starts to occur
4. Lower
ground
speed
With
Hydrostatic
Drive"
for
and below the low limit, insufficient
tachometer drive wheel (5th
additional
"Shot
Guide"
flow results m a fan which is less
wheel).
instructions.
than full width.
5. Engage truck P T O.
8. Upon completion of shot,
6. Select truck transmission
turn off spray bar and If necessary
To Spray
and if required, auxiliary and rear
decrease pump flow rate to a
1. Lower
spray
bar
to
axle setting, to give adequate
maximum of 160 G P M This Is
spraying position.
ground speed and power for the
done
to
prevent
excessive
desired application rate More than
pressure in the spray bar when not
one attempt may be necessary
spraying
before the proper gear set-
.
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