Insert flyweight pins in the flyweights and check for
brinelling (wear pockets), looseness, or stickiness. At the
same time check the flyweight bearings. Replace both
flyweights together if either one is damaged.
Figure 12-6. Ball Head Disassembly
Power pistons, buffer pistons, pilot valve bushings and
rotating bushings must have sharp edges on all lands.
Replacement is necessary if any nicks, roundness or
damage is found.
Check the magnet's magnetic field strength; it should be
1100 gauss. Jumper contacts 3 and 4 of plug (51) and
measure total resistance across terminals 1 and 2. This
resistance should be 31.6 (5 percent) ohms at 70 F
Assembly. Lubricate all packings with
petrolatum. Lubricate all seals and metal parts before
installation. Numbers on callouts of figures are the same
as numbers on figure 12-3 for cross-reference.
(1) Install all pipe plugs in case and
base per exploded view figure 12-3.
(2) Install check valves (110) in the
case (157) bottom and base (117) as
shown in figure 12-7.
(3) Assembly floating lever and
Figure 12-7. Check Valve Installation
speed adjusting lever as shown in figure 12-8.
Assembly governor pilot valve bushing (120),
pilot valve plunger (121), compensating bushing
(122) and retaining ring (123), figure 12-9.
Assemble actuator pilot valve bushing (126,
figure 12-10), pilot valve plunger (127),
compensating bushing (130), magnet adjusting
spring (129 and retaining ring (128).
Assembly clamp bracket (74, figure 12-11),
restoring spring assembly (59 to 62, 64),
transducer lever (58), restoring lever (72),
eccentric pin (71), adjustable spring seat (56), and
pilot valve plunger nut (55).
See figure 12-12.
Assembly packing (98), buffer
cap (97) and retaining ring (96) in the case.
Assembly packing (95) and screw
plug (94) in case.