Chief Manufacturing Pit Boss 638699 - Manual (Page 8)

PIT BOSS
Users Manual
6
Pump Usage
To activate hydraulic pump and apply pressure to system to
raise machine, depress the up pedal on the foot pump (See
figure 3). The pump will build hydraulic pressure in the
system to activate lift cylinders.
To disengage the hydraulic pump, release the foot pedal on
the pump. This action stops the flow of hydraulic oil to the
system being operated: however, the system holds existing
hydraulic pressure.
To release hydraulic pressure, depress the down pedal of
the foot pump. (See figure 4). This will release the
hydraulic pressure in the system and return hydraulic oil to
the pump reservoir.
CAUTION:
To prevent damage to the pump and
hydraulic cylinders, DO NOT operate
pump when cylinders are fully
extended. (If possible, stop
supplying pressure before cylinders
reach full extension)
Lock Release
The lock release is a pneumatic valve that must be pressed
to deactivate the lock arm and lower the Pit Boss (see
Figure 5).
To Lower Machine
1. Activate lock arm release by depressing and holding the
brass button on the pump stand. (See figure 5)
2. Depress and hold the “UP” pedal on the foot pump to
raise the machine until the safety lock arm audibly
releases from its lock position. (See figure 3)
3. While continuing to hold down the “UNLOCK” button,
depress and hold the “DOWN” pedal on the foot pump.
CAUTION:
• Before lowering machine, clear
all obstacles from under and
around machine.
• DO NOT allow anyone or
anything to ride on machine or
be under machine during
lowering procedures.
Adjust Working Height
The PIT BOSS lift has six (6) working heights from 9 inches
(480 mm) to 45 inches (1220 mm).
Figure 3
Figure 4
Figure 5
To Raise Machine
1. Activate pump by depressing and holding “UP” pedal on
pump.
2. After machine is slightly above desired working height,
as indicated by the audible drop of the lock arm into its
locking position, release “UP” pedal on the pump.
3. Depress and hold “DOWN” pedal on the pump to lower
machine into mechanical stops.