Poweramp VS VERTICAL SPECIALTY 4.2009 - Manual (Page 25)

23 4111-0008 — April 2008
ADJUSTMENTS
SC Adjust Main Pressure Relief
A— Motor
B— Pump
C— Main Pressure Relief D— Jam Nut
E— Acorn Nut
A
E C
D
B
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. Failure to do this may result in
serious personal injury or death.
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. Failure to do this may
result in serious personal injury or death.
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. See Troubleshooting
section.
The main pressure relief may need to be
decreased if the pump motor loads down
when platform starts to raise from the lowerd
position. See Troubleshooting section.
To adjust the main pressure relief:
1. Raise the platform fully and engage the
maintenance prop in the service position.
2. Turn OFF all electrical power to the dock leveler.
Attach safety lockout and tagout devices.
3. Remove acorn nut (E).
4. Loosen jam nut (D).
5. Adjust allen head adjusting screw (C) Under acorn
nut:
• Turn clockwise to increase pressure relief.
• Turn counterclockwise to decrease pressure
relief.
6. While holding the adjusting screw tighten jam nut
and install the acorn nut.
7. Turn ON electrical power to the dock leveler.
8. Disengage the maintenance prop.
9. Check leveler operation.
10. Repeat steps 1– 9 as necessary.
Pressure