3 of
10
C. Metal particles - Metal chips can be found from valve spools, Rotac
®
internal parts and other metal
components in the system.
The appearance of symptoms a, b, or c above, will require total flushing and cleaning of the entire
system.
2. Wash all parts thoroughly and examine for defects.
A. Shaft
(See Figure 1.)
1. Examine welded vane for cracks at "A" diameter, splines, keyways and any other area where
stress may be applied.
a. Spot-check by Magnaflux
Three different materials needed and applied in order:
SKC-S Cleaner
SKL-HF/SKL-S Penetrate
SKD-S Developer
FOLLOW DIRECTIONS CAREFULLY ON BACK OF THE CAN
b. Keyways or splines widened
may fit loosely in coupling.
This problem will only get
worse and eventually cause
shaft to break. Cause - poor
fitting coupling. Too soft
keys.
c. Scoring on "A" diameter. Any
scratch .010 or more requires
the part to be replaced.
d. Scoring or galling on shaft
journal. This problem can be
repaired with hard chrome,
however, many critical
dimensions must be held -
this type of repair must be performed by factory only.
e. Scoring or galling on end of "A" diameter. This is another problem that can be repaired;
however, it is recommended that this type repair be performed by factory only.
B. Housing/Head
1. Scoring of .010 or more on the ID of the housing requires replacement of this part. Any light scoring
can be polished out with 400-grit emery cloth or it's equivalent.
NOTE: When pressurized, the body will expand and contract. For this reason, plating or sleeving
is not recommended by the factory for repair.
2. Cracks may be found across the dowel holes, bolt holes or ports. This requires replacement.
Figure 1- Shaft
