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MAINTENANCE INSTRUCTIONS
4.15
Connect the RETRACT control housing to the control crank housing. Retract the control cable fully,
watching for any binding that may indicate damage to the control housing.
If applicable, reset the odometer to zero with the control cable fully retracted.
Replace the protective rubber cap over the end of the safety connector assembly.
Quarterly and Annual Maintenance for Source Guide Tubes
Tools required for maintenance of source guide tubes:
• A424-9XL mock source assembly to perform function tests after cleaning and inspection.
• Length of clean control cable to push A424-9 XL through a 7 ft (2.1 m) source guide tube.
• 1 in-18 tap and 1 in-18 die for male and female threads of the source guide tubes, if required.
Materials required for maintenance of source guide tubes:
• Solvent: Clean mineral spirits to clean the source guide tubes internally.
• Clean lint-free cloths and detergent to clean the exterior of the source guide tubes.
• Mil-spec grease MIL-G-23827B (or C), MIL-PRF-23827C (or equivalent radiation resistant grease) to
lubricate the swage fittings on the source guide tubes.
• Source of compressed air and hand nozzle to blow dry the internal conduit of the source guide tubes.
• 3M™ yellow polyvinyl tape (or black polyvinyl electrical tape) for repair of cuts in the source guide
tubes.
Source Guide Tube Maintenance
1 Clean the exterior of all the source guide tubes thoroughly using clean cloths and a detergent.
Remove all of dirt, grease and grime from the yellow polyvinyl source guide tubes and the swage
fittings.
2 Clean the interior of each source guide tube by pouring 4-5 oz (100 ml) of clean solvent into one end.
Manipulate the source guide tube back and forth to cause the solvent to wash the interior of the entire
length of source guide tube. Pour the solvent into a used solvent container. Refill the source guide
tube with clean solvent and repeat the cleaning operation. Repeat this cleaning process until the
solvent poured out of the source guide tube into the used solvent container is clean. Use a
compressed-air hose to blow out any residual solvent from the source guide tubes. Use of a clean
white cloth attached to one end of the source guide tube will trap any debris or residual solvent when
blowing out the source guide tubes. Repeat the cleaning process until the cloth ‘trap’ indicates dirt is
not present within the source guide tubes.
3 Carefully inspect the entire length of each source guide tube for cuts and melted areas. Repairs to cut
or melted areas can be accomplished by taping the area with 3M™ yellow polyvinyl tape (or black
polyvinyl electrical tape). Taping the damaged area of the polyvinyl sheath will prevent the ingress of
water and other liquid that would cause corrosion to the remote control cable. Carefully look and feel
for dents and depressions in the source guide tubes. Even a small inward dent in the source guide
tube could cause a seized source assembly resulting in emergency operations. A ‘mock’ (Model
A424-9XL) source assembly attached to a section of control cable that is pushed through the entire
length of source guide tube provides additional confirmation the source guide tube suitable for use.