GUIDE 3531918 - Caterpillar

Illustration 29
Servo piston with more wear than Illustration 28
Use again_97_
if wear step or scratches cannot be felt with a seal pick.
Illustration 30
Servo piston sleeve with crosshatching (1) due to honing. The anti-friction coating (2) is worn away.
Do not use again_97_
if crosshatched, or if anti-friction coating is worn away.
Illustration 31
Servo piston sleeve with gouge and anti-friction material worn away (shiny area).
Do not use again_97_
if scratches can be felt with a seal pick, or the anti-friction material is worn away.
Illustration 32
Clevis. Unless the ears remain parallel, the pin is extremely difficult to remove or install.
Use again_97_
if ears are parallel.
Note: The clevis pin should be installed in the clevis when the governor is not installed on an engine. This reduces the possibility of damaging the clevis.
Illustration 33
Clevis with ears bent inward.
Do not use again
Note: The two clevises shown in Illustration 33 and 34 should not be reused, even if they are in good condition. They should be replaced with a 108-1612 Clevis (refer to Illustration 32).
Illustration 34
Clevis with ears bent outward.
Do not use again
Illustration 35
Servo valve with narrow groove (1) for thin retainer.
Do not use again_97_
replace with servo valve having wider groove for thicker retainer.
Illustration 36
Servo valve with wide groove (2) for thicker retainer.
Use again_97_
if wear step cannot be felt with a seal pick.
Illustration 37
Servo valve with two wide grooves (3) for thicker retainer. Minor wear (4) on diameter of shaft.
Use again_97_
if wear step cannot be felt with a seal pick.
Illustrations 38, 39, 40, and 41 show various rack control and limiting sleeves which mount on the servo valve. These parts can be reused if the wear on the contact surface cannot be felt with a seal pick.
Illustration 38
Sleeve.
Use again_97_
if wear on contact surfaces cannot be felt with a seal pick.
Illustration 39
Sleeve.
Use again_97_
if wear on contact surfaces cannot be felt with a seal pick.
Illustration 40
Rack control and limiting sleeve.
Use again_97_
if wear on contact surfaces cannot be felt with a seal pick.
Illustration 41
Rack control and limiting sleeve.
Use again_97_
if wear on contact surfaces cannot be felt with a seal pick.
Riser Shaft and Pin
Illustration 42
Riser shaft.
Use again_97_
if there is no wear step on the shaft, which can be felt with a seal pick. If a step is present, it will generally occur near the center of the shaft.
Illustration 43
Normal wear on pin at end of riser shaft.
Use again
Illustration 44
Pin with material eroded away near the center relief.
Do not use again
Flyweight and Dowel
Illustration 45
Flyweight toe with gouges near dowel hole.
Do not use again_97_
if wear marks can be felt with a seal pick.
Illustration 46
Flyweight toe wear.
Do not use again
Illustration 47
Flyweight toe wear.
Do not use again_97_
if there are any signs of "flat spots". Worn flyweight toes may be highly polished so that flat spots are difficult to feel. Hold the flyweight toe surface in bright light and watch for changes in reflection in worn areas. Use a new flyweight toe for comparison.
Illustration 48
Acceptable wear on flyweight dowel.
Use again_97_
if wear cannot be felt with a seal pick.
Illustration 49
Heavy wear on flyweight dowel.
Do not use again
Note: Examine the dowel