Raco MA3-4 Installation instructions

DISASSEMBLY INSTRUCTIONS FOR MA3-4
YOU MUST OBSERVE ALL CAUTIONS AND WARNINGS POSTED
ON ALL DEVICE LABELS AND AS LISTED IN THIS MANUAL.
FAILURE TO DO SO MAY RESULT IN SERIOUS PERSONAL
INJURY OR DEATH.
WARNING! DO NOT ATTEMPT TO INSTALL, PERFORM
MAINTENANCE, OR SERVICE ANY RACO PRODUCT UNTIL YOU
HAVE READ THOROUGHLY AND UNDERSTAND COMPLETELY
ALL INSTRUCTIONS, SAFETY RULES, CAUTIONS, WARNINGS,
AND DANGERS CONTAINED IN THIS MANUAL. FAILURE TO
COMPLY CAN RESULT IN ACCIDENTS INVOLVING FIRE,
ELECTRIC SHOCK, AND SERIOUS PERSONAL INJURY OR
DEATH. SAVE THIS MANUAL AND REVIEW FREQUENTLY FOR
CONTINUING SAFE OPERATION, AND FOR INSTRUCTING
OTHERS WHO MAY USE RACO PRODUCTS.
1. Read and closely follow all Warnings, Cautions, and
Instructions in this manual. Failure to do so may result in
voiding the RACO Warranty.
2. CAUTION! You MUST check with RACO prior to any
disassembly or maintenance procedures not specifically
recommended in this Manual in order to preserve the RACO
Warranty. If unauthorized or non-recommended practices or
procedures are performed, RACO reserves the right to deny
warranty claims for any defect at the sole discretion of RACO.

CAUTION! Disassembly is not recommended under any
circumstance. However, under extreme conditions, if there is
no other opportunity to return the unit to RACO or enlist the
services of a certified RACO Technician or Repair Specialist,
the following instructions may be used as alternative
guidelines.
3. Fully and independently support the cylinder and the attached
load. If possible, disconnect the front attachment mechanism
from the load.
Disassembly of Actuators
1. Turn off and lock out the main power and control circuit power
to the actuator.
2. Support the load if necessary and remove the electrical
connections from the actuator.
3. Remove actuator to a clean work environment.
4. If the actuator is jammed in the extreme extended or retracted
position, refer to the un-jamming instructions first.
Disassembly of Acme Screw Thrust Unit
(Loctite Gasket eliminator 515 is used on all metal to metal
exposed surfaces, and Loctite 271 is used on all threadlocking.
271 requires heat to break it loose.)
1. Remove the clevis assembly.
2. Remove the front cap.
3. Remove the shield tube.
4. Remove the guide rods.

5. Remove the thrust tube. (remove set screw first, if present, or
heat and overpower the Loctite threadlocker if no set screw is
present)
6. Remove the front screw guide. (Some simply snap on others
are retained by a roll pin and washer.)
7. Remove the bronze nut and nut housing assembly by turning
it off the screw.
8. Disassemble the nut housing by first removing the stop screw
from the bronze nut. The Belleville springs are preloaded and
require partial pressing to remove the snap ring. DO NOT
OVER COMPRESS.
9. Remove bolts 4.3 from the face of trunnion bearing block 3.1.
(sz 3 are under rubber plugs)
10. Coupling housing and motor will now separate from thrust
unit.
For ballscrew actuators do not remove the ball nut. Re-
assembly is difficult and the loss of bearings is likely.
Motor Disassembly
1. If accessories are mounted to the rear of the motor see the
instructions for disassembly of the accessories.
2. Remove the bolts holding the front bearing housing to the
motor and separate the housings. The rotor will also come out
of the stator at this time.
3. Remove snap rings and bearings.3.
Screw/Trunnion bearing block disassembly
1. Remove coupling and locknut/jamnut combination.
2. Press screw forward from the assembly.
3. Remove snap rings to remove bearings.