Broderson IC-100-3A, Operation And Maintenance Manual

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3-20
TELESCOPE CYLINDER HOLDING VALVE:
A holding valve is directly connected to the base of the primary telescope cylinder rod.
The valve is to hold the boom in position should loss of power or pressure line failure
occur.
The holding valve should be checked with the boom elevated to the maximum angle and
the boom extended to a 5 - foot (1.5 m) load radius. A 20,000 - pound (9000 kg) load on a
two-part line is required for this test. Use the hoist to lift this load about 6 inches (15 cm)
above the ground.
The radius of the test load should be within the rating on the capacity chart. Use great
care to prevent the load from hitting the crane.
Turn the engine off and pull the TELESCOPE lever to the RETRACT position. If the
boom retracts, the valve should be adjusted. To adjust the holding valve, loosen the
lock nut on the adjusting screw and tighten screw until unpowered movement stops.
Retighten the lock nut to hold the proper adjustment.
ENGINE MAINTENANCE
AIR CLEANER SERVICE:
Clean out the dust cup every 50 hours. Loosen the clamps around the cup and housing
and remove the cup. Dump dust out of cup. Clean gasket and sealing surfaces with a
damp cloth. Replace cup gasket if it shows signs of damage. Replace cup with arrows
pointing up and tighten clamp. Clean the intake cap screen every 50 hours, and perform
a thorough inspection of the air intake pipes and joints.
Clean the filter element every 250 hours or every 3 months, whichever comes sooner
and replace the element every 500 hours or 6 months. Remove and clean the dust cup
and gasket, and the intake cap. Remove the wing nut on the element and gently remove
the element. Bumping the element during removal may cause dirt to fall into the clean
air tube. Clean the inside of the housing carefully with a damp cloth. To clean the
element, use a compressed air blower nozzle with less than 100 PSI (690 kPa) and blow
air from the inside of the element. Shake dust off of the outside of the element. Make
sure the gaskets and element fit properly and reassemble, being careful not to allow any
dust into the intake pipe.
Do not remove an element just for inspection. This may do more harm than good. You
cannot judge the element condition by its appearance. If you think the filter may need
service, remove it and replace or clean it before reassembling air cleaner. Conditions
where more dirt than usual is in the air, especially soot, will make more frequent service
necessary. If there is a significant amount of dust in the dust cup when it is cleaned
every 50 hours, clean the element every 100 hours and replace it every 200 hours--or
more frequently in extremely dusty conditions. Excessive exhaust smoke or loss of
power may indicate a plugged filter.