Emerson Bettis CBB Series - Section 3: Actuator Reassembly; General Reassembly

May 2012
Service Instructions
137465E Rev. F
9
Section 3: Actuator Reassembly
Actuator Resassembly
Section 3: Actuator reassembly
3�1 General reassembly
CAUTION: CHECK SHELF LIFE OF SEALS
Only new seals that are still within the seals expectant shelf life should be installed into the
actuator being refurbished.
3.1.1 Remove and discard all old seals and gaskets.
3.1.2 All parts should be cleaned to remove all dirt and other foreign material prior to
inspection.
3.1.3 All parts should be thoroughly inspected for excessive wear, stress cracking,
galling and pitting. Attention should be directed to threads, sealing surfaces
and areas that will be subjected to sliding or rotating motion. Sealing surfaces of
the cylinder, torque shaft and center bar must be free of deep scratches, pitting,
corrosion and blistering or aking coating. On the CBB models, there are two
O-Rings on the torque shaft and two extra O-Rings beneath the washers on the
housing. These items MUST be replaced upon re-assembly
NOTE:
Prior to installing new seals: Fit the torque shaft snap ring groove with installation rings
that come with the CBB service kits. These rings help guide the torque-shaft through the
housing and seals which will prevent seal damage. First, take out both old seals, then install
the rings onto the shaft, and then install seals in housing. Once this is done, remove install
rings and proceed. See LCD PAK installation instructions, Part Number 153955, for details.
Coat torque shaft LCD PAK seals (2-20) with lubricant and install in one of the grooves
located in the torque shaft bore of the housing (1-10).
The cup/lip of torque shaft seal will be installed facing inward into the housing. For the CBB,
coat the torque-shaft O-Ring (2-25) with grease upon installation.
The following steps used to reassemble the following models: CBB315, 420, 520, 525 and
725. Use assembly drawing part numbers 129738 and 152230 for this section.
CAUTION: REPLACE WITH NEW PARTS.
Actuator parts that reect any of the above listed characteristics may need replacement
with new parts.
3.1.4 INSTALLATION LUBRICATION INSTRUCTIONS: Use the correct lubrication as
dened in Section 1 step 1.6.
3.1.4.1 Before installation coat all moving parts with lubricant.
3.1.4.2 Coat all seals with lubricant, before installing into seal grooves.