The rotor and hydraulic head are
matched parts and shall be replaced
as a unit.
(5) Check the vent wire in the hydraulic head air bleed passage for
freedom of movement. If the wire is free, flush the head and
blow out all passages with clean, dry compressed air. If the
wire is stuck, replace it after thoroughly cleaning the pas-
(6) Check each cam roller for freedom of rotation in its shoe.
Check each shoe for chipping or wear on the surface contacted
by the leaf spring.
(7) Check the leaf spring for cracks, nicks, chipping, or distor-
tion. Check for damage and wear along rotor radii contact
points and steps which retain roller shoes.
(8) Examine the retainer sockets of governor weight for evidence of
wear and damage. Replace the flexible snap ring (6, figure
of the weight retainer.
(9) Inspect the pivot points of the governor arm (7, figure 8-11)
pivot shaft for wear. Check the governor arm tabs at the point
which contacts the thrust sleeve. If either tab is worn flat,
replace the governor arm.
(10 ) Examine the junction points of the metering valve pin hole in
the linkage hook, throttle lever, shutoff cam, and shutoff lever
for looseness and burrs.
(11 ) Check the metering valve body for wear. Ascertain that the
metering valve arm is well seated and there is not radial
movement of the arm on the valve. Check the metering valve
arm pin for wear or looseness.
(12 ) Carefully inspect the bore and edges of all flat surfaces of the
cam. If evidence of spalling or flaking out exists, replace the
Since only the working portions of
the cam lobes on the bore are ground,
the tool marks between lobes should
not be considered as damage. The cam
finish is mottled from heat treatment
rather than operation.