Bray 98 Series - Manual (Page 32)

All information herein is proprietary and confidential and may not be copied or reproduced without the expressed written consent of
BRAY INTERNATIONAL, Inc. The technical data herein is for general information only. Product suitability should be based solely upon customer’s
detailed knowledge and experience with their application.
S98 O & M : 32
Series 98 Operation & Maintenance
8. Install a suitable 3 position manual valve to the pneumatic
cylinder’s ports, which will either connect the ports to the air
supply or vent them to atmosphere. The ports must be vented
when operating the manual override (Refer to Figure C).
16.1.2 Operating DA Jackscrew Override
1. To test / operate the override, shut off the main air supply and
turn the 3 position valves on the cylinder ports to vent the
ports to atmosphere.
2. Turn the hand wheel on the jackscrew assembly to move the
screw forward, until it touches the extension rod’s end.
3. Push the slide key into the jackscrew head to couple it with
the extension rod.
4. Turn the hand wheel to turn the actuator in required direction
(see direction markers on the hand wheel).
5. After completing the manual override stroke, disengage the
coupler by pulling out the slide key. Back off the jackscrew
completely before restoring automatic operation.
NOTICE
The jackscrew is not designed as an extended travel stop. It
must be taken to fully backed-off position for the actuator to
work normally in automatic mode. Turn the 3 position valves to
connect the air supply to restore automatic operation.
CAUTION
The extension rod moves back and forth in normal operation.
Do not remove any protective covers on the DA jackscrew
assembly without ensuring the air supply is cut off and that the
automatic operation of actuator is disabled.
Push (Engage) Pull (Disengage)