PURPOSE
The purpose of these instructions is to provide
a step-by-step method for replacing the Beck
42-109 control end assembly. The screws and
washers included in Table 1 are provided as part of
the replacement kit in the event that some are lost
while servicing the actuator. The subassemblies
listed in Table 2 are included with the control end
assembly. The replacement control end assembly
has been fully calibrated at the factory. This
replacement procedure will return the actuator to
a close approximation of its original calibration.
Do not calibrate the actuator until this procedure
is complete, and then only if necessary. Refer to
Beck Instruction Manual 80-0042-01 for complete
calibration instructions.
REQUIRED TOOLS
1/2” socket or wrench
3/32" hex driver
Scotch™ 847 gasket adhesive or equivalent
Torque wrenches appropriate for 12 lb-in and 10 lb-ft
Fine point marker
3/16" flat-tipped screwdriver
Grounding strap
Wire cutter
WARNING
WARNING
Electrical shock hazard—disconnect
power before proceeding. Remove
the actuator from line voltage and
shut off any external power sources
feeding the auxiliary switches
.
PROCEDURE
Remove the old control end assembly:
Refer to Figure 1 for component identification.
1. Remove power from the actuator.
2. Remove the control end cover by loosening
the (4) 5/16-18 hex head captive screws. Be
careful not to bend the control shaft or damage
the position-sensing assembly inside.
CAUTION
To prevent Electro-Static Discharge
damage to the electronics, wear a
grounding strap during this procedure.
3. Cut the small cable tie which connects the switch
assembly lead wires to the Printed Circuit board
lead wire.
4. Disconnect the control end assembly electrical
circuits by unplugging the three multi-pin
connectors from the actuator. Two connectors
lead from the switch subassembly and the
other connector leads from the P.C. board. To
disconnect the switch subassembly connectors,
use a 3/16” flat-tipped screwdriver to press the
release tab straight back (see Fig. 1) and pull
the plug out of its socket. The connector leading
from the P.C. board slides off with modest force.
5. Loosen the outermost setscrew on the coupling.
Do not loosen the inner setscrew.
6. Use a fine point marker to note the position of the
control end relative to the actuator body. Mark
the face of the actuator immediately adjacent to
the top of the notch (see Fig. 2).
7. Loosen (do not remove) the mounting clamp
screws, (4) #8-32 socket button head screws (2
per clamp), and slide the top clamp up over the
edge of the shoulder in the actuator, immediately
above the stator flange. Snug one of the
screws to hold the clamp up while replacing the
assembly. Allow the bottom clamp to hang by
the screws.
8. Slide the control end assembly away from the
actuator body until it clears the control end shaft.
Install the new assembly:
9. Inspect the control end cover gasket and replace
as necessary. If the gasket is in good condition,
skip to step 15.
10. Protect the CPS-4 with a static-free cover.
E L E C T R I C A C T U A T O R S F O R I N D U S T R I A L P R O C E S S C O N T R O L
Continued
80-4284-05
Rev. 2
REPLACEMENT INSTRUCTIONS
CONTROL END ASSEMBLY
REPLACEMENT KIT P/N 12-8064-55
MODELS 42-109
R