Elliott ET850 Series, Operating And Maintenance Instructions Manual

Page: 17 / 22

ET850 Pneumatic Rolling Motors
17
MAINTENANCE INSTRUCTIONS
The proper performance and service life of every machine depends on how well it is maintained.
The following should become a regular routine of operations.
Shut-Off Adjustment
If consistent torque cannot be maintained, check the Shut-Off Trip mechanism. Remove the Trip Cover
(pg 9) to expose the mechanism. During forward operation, the Trip abuts the Valve Spindle as shown.
This abutment should be set using the included Trip Gage as shown to 0.062” of engagement with
the Valve Spindle. This allows shut-off to occur midway through the total travel of the Trip, ensuring
repeatable torque. This procedure should be completed with the torque setting at “5”.
Cam Case Subassembly (pgs 12-13)
Remove entire assembly by removing socket head cap screws. Remove Internal Retaining Ring
(13). Carefully remove Drive Cam (28) and Operating Cam (25), avoiding loss of the bearing balls in
the assembly. Remove, clean, and examine Spindle (1). If there is wear or dimpling in the ball spline
grooves, the Spindle should be replaced. Check Bearing for wear and replace if necessary. Check
Follower (22) for wear and replace if necessary.
To reassemble, install Spindle (1) and secure with External Retaining Ring (14). Place Operating Cam
(25) on spindle and align the grooves. Place one Guide Spring (6) and five precision 5/32” balls (12)
in each groove (due to precision, no substitution should be made). Install Ball Retainers and using
grease place two larger balls on each helical face of the Operating Cam (25). Install the Drive Cam (28)
carefully without dislodging the balls from the helical faces. Install the Internal Retaining Ring (13).
Reassembly to Motor Case requires depressing the trip to avoid interference with the Spindle until
Socket Head Cap Screws are installed.
Motor And Gear Package Subassemblies (pgs 10-11, 14-15)
After removing Cam Case Subassembly (above), slide out the Motor and Gear Package Subassembly.
Disassemble the motor by removing the Front Thrust and check for wear in the Cylinder. Inspect the
Paddles and replace if worn. To reassemble, perform the reverse ensuring proper placement and
movement of Paddles. Slide Motor into Motor Case placing the protruding pin into the locating hole in
the bottom of the Motor Case.
The ET850-600 Gear Package Subassembly is a two stage planetary gear set. Slide gears from the
Gear Case, clean, and inspect for wear. Grease gears before reassembly into Gear Case. Insert the
Gear Package Subassembly into the Motor Case and insert Dowel Pin.
WARNING
!
Warning: Remove air supply prior to disassembly or
service.