The PT-70/80 are equipped with
high and low flow auxiliary
hydraulic circuits that allow for
the use of hydraulic attach-
ments.
The couplers for the auxiliary cir-
cuits are located on the left side
of the lift arms near the front of
the machine. They are posi-
tioned from top to bottom as
such: (see photo)
A.
Case drain
B.
High flow
C.
High flow
D.
Low flow
E.
Low flow
The PT-70/80 uses a variable
displacement pump to supply oil
to the low and high flow auxiliary
circuits. This pump displaces
30gpm when the high flow
switch is activated and 20gpm
when the low flow switch is acti-
vated.
To prevent an operator from
accidentally sending 30gpm
through a low flow attachment,
the machines are equipped with
a switch mechanism that dis-
ables the high flow switch when
an attachment is connected to
the low flow quick couplers.
Note:
Low and high flow circuits
may not be used simultaneously.
Low Flow Intermittent
The low flow auxiliary circuit can
be utilized intermittently or con-
tinuously. It also has the capabil-
ity of varying attachment speed
through the use of a spring cen-
tered roller switch (F) located on
the back of the right joystick.
Attachment direction is deter-
mined by rolling the switch to the
right or left or center. Attachment
speed is determined by the
amount that it is rolled in the
chosen direction. This variability
gives the operator more control
over the actuation speed of the
attachment.
To activate the low flow auxiliary
hydraulic circuit intermittently,
roll the switch left or right of cen-
ter.
• To pressurize the upper low
flow quick coupler, roll the
switch to the left of center.
• To pressurize the lower low
flow quick coupler, roll the
switch to the right of center.
• To de-activate low flow inter-
mittent operation, release the
variable switch and flow will
cease.
CONTROLS
Auxiliary Hydraulic
19
A
C
B
E
D
F
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