Poweramp VH SERIES HYDRAULIC - Manual (Page 28)

26 4111-0002 — January 2012 26
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 SAE plug (A).
4. Adjust hex adjusting screw (B) in small 1/4 turn
increments as follows:
• Turn clockwise to increase pressure relief.
• Turn counterclockwise to decrease pressure
relief.
5. Tighten the jam nut and install the SAE plug.
6. Turn ON electrical power to the dock leveler.
7. Disengage the maintenance prop.
8. Check leveler operation.
9. Repeat steps 1– 8 as necessary.
A— SAE Cap Screw
B— Hex Adjusting Screw C— Main Pressure Relief
D—Reservoir
Adjust Main Pressure Relief
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 reaches the full raised
position. See Troubleshooting section.
ADJUSTMENTS
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.
Always stand clear of the dock leveler lip when
working in front of the dock leveler.
The maintenance prop MUST be in the service
position when working under the dock leveler.
For maximum protection, use an OSHA approved
locking device to lock the maintenance prop in
the service position. Only the person servicing
the equipment should have the key to unlock the
maintenance prop.
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.
Failure to follow these instructions may result in
serious personal injury or death.
C
D
A
B