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Changing the Pump Drive Gearbox
Fluid
Service Interval: Every 400 hours/Yearly (whichever
comes first)
1. Position the sprayer on a level surface, set the parking
brake, stop the pump, stop the engine, and remove
the ignition key.
2. Place a pan under the drain plug on the pump drive
gear box (Figure 73).
Figure 73
1. Pump drive gearbox
2. Fill tube
3. Remove the fill plug and drain plug (Figure 73),
allowing the oil to drain into the pan.
4. Install and tighten the drain plug when the fluid
stops draining.
5. Add approximately 1 quart (1 L) of Mobil SHC 634
Synthetic Lubricant to the fill tube.
Important: Use only Mobil SHC 634 Synthetic
Lubricant or equivalent synthetic fluid in the
gear box. Non-synthetic oils may break down
causing damage to the pump gearbox.
6. Install the fill plug.
Adjusting the Boom Actuator
Service Interval: Every 400 hours—Check boom
actuator hydraulic oil for air bubbles.
1. Position the sprayer on a level surface, lower the
booms into the spray position.
3. Drain plug
2. Set the parking brake, stop the pump, stop the
engine, and remove the ignition key
3. Attempt to lift the boom by applying a moderate
amount of pressure (just enough to lift the boom
manually) while observing the actuator rod. If the
actuator rod exhibits movement refer to below.
4. Repeat the procedure for the opposing boom.
If the actuator rod exhibits an axial movement (travels
into or out of the cylinder) greater than 0.085-0.100 inch
(2.16-2.54 mm), you may wish to bleed the air from the
hydraulic oil.
Refer to the Service Manual for instructions on how to
bleed air from the actuators or contact an Authorized
Toro Service Distributor.
Emergency Manual Operation
of the Boom Actuators
Note: Determine the left and right sides of the machine
from the normal operating position.
Use of the manual relief valve may cause the
boom to move suddenly and cause injury to you
or others.
• Take caution and adjust the manual relief
valve slowly.
• Ensure the surrounding area is clear and
no one is inside the operating range of the
boom.
Adjusting the manual relief valve with electrical
power present could cause the actuator operate
irregularly and cause injury to you or others.
Do not use the manual relief valve while
electrical power is being supplied to the
actuator.
In case of an emergency such that the boom must be
moved and no 12V DC power source is available, the
manual relief valve can be used to relieve pressure within
the actuator and allow the booms to be moved manually.
Important: The manual valve must not be loosened
more than 4 turns. Turning the valve more than 4
turns may cause the valve to come off completely
allowing hydraulic oil to spill out.
57
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