PAGE 48 — C-30HDN PUMP — OPERATION AND PARTS MANUAL — REV. #11 (03/29/12)
C-30HDN PUMP — ENGINE RPM ADJUSTMENT
The governor is factory adjusted and needs no further
adjustment. DO NOT adjust governor bolt unless absolutely
necessary. Refer to the
Engine RPM Hunting
section.
ENGINE RPM ADJUSTMENT
Prior to final adjustment, the engine
must be warmed up until the water
temperature become 176 degrees F
(80 degrees C).
This procedure should be performed without engine load. The
hopper should be empty of material or water. The throttle control
knob must be pushed into the IDLE position.
PROCEDURE
The following procedure references Figure X:
1. Remove the linkage rod from governor arm (ball joint) to
carburetor, using 7mm and 8mm wrenches and adjust
overal rod length to 12.5 inches (31.75 cm.) Once rod length
has been correctly adjusted, reconnect to the governor arm.
2. Throttle Cable Travel Adjustment:
A. Push the
throttle cable
all the way in. Note the governor
spring should have no tension.
B. Adjust the idle speed by starting the engine and adjust-
ing the carburetor idle set screw between 850~900
RPM’s (use a tachometer to verify engine RPM’s).
C. Once the idle adjustment has been made, turn the pump
control switch to the ON position. Using a tachometer
observe that the idle speed remains between 850~900
RPM's.
3. Adjust the RPM Adjustment Bolt:
A. With the engine running, turn the
pump control switch
to the ON position, slowly pull the
throttle control knob
toward the full throttle position. The engine speed should
read between 2,750~2,800 RPM’s.
B. Leave the throttle setting in this position when adjusting
high RPMs and turn the engine OFF. The close proximity
of moving parts makes this adjustment safer with the
engine OFF.
C. Locate the
High RPM adjustment bolt
. Using a 12 mm
wrench, loosen the jam nut and slowly turn adjustment
bolt until it touches the stop on the governor arm. Lock
jam nut in place.
D. Start the engine and verify using a tachometer that the
engine speed now reads between 2,750~2,800 RPM’s.
If engine RPM's are not within the above range, repeat
step 3 until corrected.
The governor and solenoid adjustments are now complete and
the linkage will now allow full carburetor throttle shaft movement
if ever needed. Under nomal conditions these adjustments will
not be noticeable, however during conditions of extreme heavy
loading an increase in performance can be observed.
ENGINE RPM HUNTING
The term "
hunting
" means sudden fluctuations in engine speed
attended by vibration. Be sure to check for engine hunting when
maximum engine speed under no load has been adjusted.
1. Quickly move the throttle lever to fully open position under
no
load
to determine whether engine "hunting" action occurs
more than three times.
2. If hunting occurs more than three times, move the governor
adjustment bolt 4 mm (0.16 in.) towards the outer end of the
sliding groove.
3. Repeat Step 1 until "
hunting
" does not occur more than three
times.
4. If specified maximum RPM is changed due to adjustment of
governor bolt, adjust the tension of governor spring with
governor adjustment not until engine speed reaches specific
speed under no load.
CAUTION -
DO NOT Adjust the Engine Governor
NOTE
NOTE
If the clutch engages it will be
necessary to adjust the low engine
idle RPM. Adjust the lower linkage
rod until the engine speed reads
830~900 RPM's.