SM321009D
Page 5 of 9
©Aero-Motive Nov-03
MAIN SPRING REPLACEMENT
WARNING:
To prevent personal injury, death or property damage,
hold center of spring down as the hub is pulled out. If the
center is allowed to rise up, the spring may escape from
its container. Hazards or unsafe practices COULD result
in
severe
personal injury or death. DO NOT remove the
spring from its container.
WARNING:
To prevent personal injury, death or property damage, handle all springs with care. Use
suitable protective gloves for spring handling. Hazards or unsafe practices COULD result
in
severe
personal injury or death.
NOTE:
It is recommended to replace all springs since unbroken springs of same age will likely need
replacement very soon as well. Failure to do this will result in much more frequent maintenance.
It is advisable to wear gloves or other suitable hand protection since sharp edges may be encountered
when handling springs. Follow same instructions as for collector ring replacement above. Remove four
hex head cap screws on the goose neck fitting, then remove from entrance ring. Remove six bolts on
entrance ring and pull off main shaft along with driving ring and spacer. Remove spool so spring and cup
assemblies are exposed.
Each spring assembly can now be removed in their cup shaped containers. Lift each spring off main shaft
being careful to disengage the hub first by rotating it in the tension reducing direction until a click is heard
and hub is unhooked. Grab under each edge with your hands to help hold the spring in the pocket while
lifting off and until it is safely right side up on bench. If spring is pulling out of pocket stop process and
attempt to disengage.
The parallel spring 1300 and 1500 series units come with interlocking parallel spring pockets and with
doublewide hubs. If the hub starts coming off with the top spring do not be alarmed. Just make sure it
doesn’t pull the spring out of pocket.
When disposing of old or broken spring assemblies, coils should
be welded or wired together to prevent possible injury to scrap
handling personnel. Replace broken spring assembly, and
reassemble the springs in reverse order. When replacing spring
assemblies make sure that the square projection, on the end of
the spring hub below, is properly engaged in the opening of
adjacent spring cup.Refer to parts drawing for part sequence and
location.
LUBRICATION
Springs and bearings have been sufficiently lubricated at the factory to last for the normal life of
the motor. If grease has been removed during maintenance it should be replaced with good quality high-
low, temperature grease (Texaco AFB 2 or equal). Bearings should be packed, and springs should have
enough grease in the cup to thoroughly coat the entire spring as it works in during use.
