Multi Pro 1200/1250Page 6 -- 60Spray System
Boom Actuator Service
IMPORTANT: Do notdismantle,repairor modifythe
boom actuator. Internal components are not avail-
able for the actuator. If an actuator is damaged or
worn, replace actuator.
CAUTION
During and after operation, the actuator may be
very hot. To avoid possible burns, allow the ac-
tuator to cool before working on it.
Actuator Circuit Protection
Each boom actuator is protected internally by a thermal
circuitbreaker.Incaseofactuatoroverheating,thether-
malbreakerwilltrip,causingtheactuatortoceasefunc-
tioning. Once the actuator cools to appropriate
operatingtemperature,theactuatorthermalbreakerwill
reset to allow actuator operation to resume.
A separate 30 amp thermal breaker also protects each
boom actuator circuit. These thermal breakers are lo-
cated at the machine fuse panel and will prevent circuit
operationifoverloaded. Thethermalbreakers resetau-
tomatically.
Actuator Freeplay Inspection
Over time, actuator operation may be affected by air
capturedin the reservoiroil.An excessiveamountof air
in the actuator oil will allowexcessiveactuatorfreeplay.
Excessive freeplay will allow spray boom bouncing
when driving over severe terrain.
Measure actuator freeplay using the following proce-
dure:
1. Movethevehicletoanopenareaandlowerthespray
booms to the spray position.
2. Lift up on the boom at the last triangular gusset with
a 25 pound (11.4 kg) force. Support boom in that posi-
tion.
3. Using anon--permanentfelt tippedmarker,mark the
cylinder rod at the outside of the cylinder seal.
4. Release the spray boom and allow it to return to the
spray (fully lowered) position.
5. Determine the actuator freeplay by measuring the
distancefromthemarkonthecylinderrodtothecylinder
seal. The freeplay should be less than 0.100” (2.5 mm).
If excessive freeplay is found, bleed air from actuator.
Actuator Air Bleeding
If actuator freeplay is excessive, air bleeding of the ac-
tuator should be performed using the following proce-
dure:
1. Make sure that the exterior of the actuator is thor-
oughly clean to prevent contaminates from entering the
actuator.
2. Makesurethattheactuatorcylinderisfullyretracted.
IMPORTANT: To prevent actuator damage, use vise
with protective jaws when clamping actuator.
3. Placetheactuatorinavisemakingsurethatactuator
is clamped in the area identified in Figure 66. Use just
enough clamping force to hold the housing securely.
Make sure that the reservoir plug is orientated up.
CAUTION
The actuator reservoir is pressurized. If the res-
ervoir plug is removed too quickly, oil under
pressure can be ejected from the actuator.
4. Slowly loosen and remove the reservoir plug at the
top of the reservoir.
5. Using a light through the plug hole, confirm that the
reservoir oil is clear. If the oil appears milky, air is en-
trained in the reservoir oil. Keep the actuator vertical
with the plug removed for approximately fifteen (15)
minutes to allow the air to separate from the oil.
6. Whenoilappearsclear,usea12voltDCpowersup-
ply to power the actuator and extend the cylinder com-
pletely.
IMPORTANT: To ensure proper reservoir pressure,
make sure that cylinder is extended before instal-
ling reservoir plug.
7. Installthereservoirplugandtorquefrom45to60in--
lb (5.1 to 6.8 N--m).
8. If reservoir oil was milky, use power supply to con-
tract and extend the actuator cylinder three (3) times.
Repeat steps 2 through 7 until oil is clear.
9. When actuator oil is clear and plug has been
installed,use powersupplyto fullycontract theactuator
cylinder. Remove actuator from vise and install on ma-
chine.
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