TESTING AND ADJUSTING
is not in good condition.
Push plug (3) down in the bore and remove the
Put plate (2) in position, and install the three
bolts and tighten them to 10 N-m (90 lb. in.).
Install tube assembly (1) on the governor.
Be careful not to get paint or other foreign material
REMOVE OIL LINE
down in the bore, as this will affect the control
1. Tube assembly. 2. Plate.
Remove tube assembly (I) and plate (2) from the
3500 ENGINE PNEUMATIC SPEED CONTROL
Install one of the bolts for plate (2) into plug (3)
as shown and pull plug (3) out of its bore.
FEEDBACK SPRING AND SPEED SETTING PISTON
*The speed settings shown are for the standard
3. Plug. 4. Piston. 5. Spring.
governor setting air pressure of:
Low Idle 35 kPa (5 psi) or 70 kPa (10 psi)
With plug (3) out of the bore, speed setting
High Idle 380 kPa (55 psi) or 415 kPa (60 psi)
piston (4) and feedback spring (5) can be lifted
**The spring identification number is on the flat
out of the bore with a magnet.
ground surface on one end of each spring.
Find the correct feedback spring to use for the
Speed Range Bellows Adjustment
air pressure range and engine speed rating from
the pneumatic speed control spring chart.
The bellows is made off-center (eccentric) to the
top flange area. The bottom of the bellows has a swivel
Install spring (5) in the bore over the speed
pin that engages the hole in the end of the speed setting
lever. The swivel pin is set off-center (eccentric) to the
bottom of the bellows but is in line with the center of the
Place piston (4) over spring (5) and push it down
air inlet port in the top of
into the counterbore.
Install a new seal on plug (3), if the original seal