Poweramp LHP Series, Owner & User Manual

Page: 34 / 52

32
4111-0012 — Sept. 2018
© 2018 Systems, LLC
Adjust Main Pressure Relief
Main Pressure Relief Adjustment
Note: The main pressure relief may need to be
increased if the platform does not rise or rises slowly
and the system operates in pressure relief mode.
The main pressure relief may need to be decreased
if the pump motor loads down when platform reaches
the full raised position.
See Troubleshooting section on pages 34-37 for
more information.
1. Raise the platform fully and engage the
maintenance prop in the service position.
2. Turn OFF all electrical power to the dock leveler.
A — Sequence Valve
B — Pressure Relief Valve
C — Fluid Reservoir
D — Motor
3. Attach lock out/tag out devices.
4. Loosen jam nut on pressure relief valve ( B ).
5. Adjust hex adjusting screw as follows:
• To increase pressure relief, turn hex screw
clockwise in 1/4 turn increments.
• To decrease pressure relief, turn hex screw
counterclockwise in 1/4 turn increments.
6. Tighten the jam nut on pressure relief valve ( B ).
7. Turn ON electrical power to the dock leveler.
8. Remove lock out/tag out devices.
9. Disengage the maintenance prop.
10. Cycle leveler and verify pressure relief setting.
11. Repeat steps 1– 10 as necessary.
When service under the dock leveler is required,
always lock all electrical disconnects in the OFF
position after raising the platform and engaging the
maintenance prop.
Always post safety warnings and barricade the
work area at dock level and ground level to prevent
unauthorized use of the dock leveler before
maintenance is complete.
A hard hat or other applicable head protection
should always be worn when working under or
around a dock leveler.
Always stand clear of platform lip when working in
front of the dock leveler.
Unless the dock leveler is equipped with a tethered
remote, two people are required to engage the
maintenance prop: one person to operate the unit,
the other person to engage the maintenance prop.
In addition, it is recommended and good safety
practice to use an additional means to support
the dock platform and lip anytime when physically
working in front of or under the dock leveler. This
additional means may include, but is not limited to a
boom truck, fork truck, stabilizing bar or equivalent.
ADJUSTMENTS
Figure 25
D
B
C
A