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3 Maintenance
Always use Alfa Laval genuine spare parts.
Step 2
Apply 60 psig air to end cap. The packing and bushing will be
forced out of their counter bores, which will result in an air leak.
Step 3
Remove air supply once the bushing and packing are forced out.
Step 4
Remove end cap, bushing, and packing from the actuator and repeat at other end of actuator.
Step 5
Place red indicator cap over the actuator stem threads.
Step 6
Wipe stem clean. Lubricate new packings with C137 lubricant.
Step 7
Slide new packing over the red indicator cap/stem with the "v" side facing the actuator. Partially insert packing into smallest
counter bore using a flat tool to assist the outer lip DO NOT DAMAGE OR ROLL THE PACKING LIP DURING INSTALLATION.
Step 8
Remove the red indicator cap. Place bushing on top of the packing. Push on the bushing until outer flange is flush with
the actuator.
Step 9
Repeat to the other end of the actuator.
ACTUATOR STEM NYLON LOCK REPLACEMENT
The Nylon Locking Pin located in the middle of the stem thread keeps the valve stem from becoming loose due to vibrations.
After every disassembly, the nylon locking pin must be replaced. Punch out the old nylon pin with an 1/8 inch or smaller
diameter punch. Insert a new nylon locking pin.
ACTUATOR LUBRICATION
For optimum performance, lubricate once annually. Inject C137 or STP oil treatment into the unthreaded thru hole in each end of
the actuator. Roll actuator on a flat surface repeatedly to obtain uniform coverage of lubricant. Do not over lubricate. This is
not a remedy for actuator failure.
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Summary of Contents for 741 Series
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