Page 40
Systems Descriptions
Contact The Braun
Corporation before
adjusting hydraulic
pressure relief valve.
Failure to do so may
result in serious
bodily injury and/or
property damage.
WARNING
Relief Valve Adjustment Procedure:
1. Position a 9/16" wrench onto the hex nut retaining
the Allen screw. Insert a 3/16" Allen wrench into the
Allen screw. Secure the Allen screw and loosen the
hex nut.
Do not
remove nut or Allen screw.
2. Place load on platform (equal to weight not lifting).
3. Hold the hex nut and turn the Allen screw clockwise
until pump lifts the load. Turn the Allen screw in an
additional 3/4 turn, then unscrew it 1/4 turn. This
action ensures that relief valve protection has not
been adjusted out of the system.
4. Secure the Allen head screw and tighten the hex nut
retainer (locking nut)
securely
.
L
Relief Valve (Pump Cover Removed)
Cylinder Mounted Flow
Control Valves (pressure
compensators):
VL917 Series
lift models are equipped with
two external flow control valves
(one for each lift main cylinder).
This device is sized to allow
unrestricted hydraulic fluid to
flow in and out of the lift cylin-
ders during normal operation.
The valve meters a limited rate
of oil flow from the lift cylinders
in the event there is an external
hydraulic fluid leak between the
cylinders and the pump, (pre-
venting rapid platform descent).
This is a nonadjustable fixed
valve. The arrow on the valve
points toward the pump (hex nut
toward the cylinder).
Pressure Relief Valve:
This
adjustment on the pump unit
limits the maximum oil pressure in
the system to a safe level. It also
keeps the amp draw and battery
drain at a minimum when the
cylinders reach full stroke. The
M258 pressure relief valve is
preset at 2100 psi.
Do not
tamper with this adjustment
unless absolutely necessary (will
not lift load) and then,
only
after
contacting The Braun Corpora-
tion.
Relief Valve Access:
The
pump module cover must be
removed to access the relief
valve (access hole not pro-
vided).
Allen Screw
Hex Nut
Hydraulics
(continued)
