Purging (Bleeding) Air; Draining And Flushing The System - Greenlee 980 Instruction Manual

Maintenance (cont'd)

Purging (Bleeding) Air

When purging air from the system:
• Do not advance the ram more than 3/4 of its
stroke. Overextending the ram will allow hydraulic
fluid to leak out, and the ram may damage the
O-rings when it retracts.
• Do not restrict the ram travel to run the pump up
to full pressure (commonly called dead heading
the pump).
Failure to observe these precautions can result in
injury or property damage.
Erratic performance may indicate air in the hydraulic fluid.
1. Remove the ram from the accessory (conduit bender
frame, cable cutter, etc.).
2. If possible, position the pump so that it is located
higher than the ram. This will allow air to travel up
the hydraulic hose to the pump reservoir.
3. Place the ram in a vertical position with the hose
coupler upward.
4. Rotate the control lever counterclockwise (to
MANUAL RELEASE).
5. Start the pump and, using the ram scale as a
reference, advance the ram 3/4 of its stroke. Stop
the pump. Do not overextend the ram!
6. Rotate the control lever clockwise (to AUTO
RELEASE). The ram will retract, forcing any air out
through the hose, into the pump reservoir, and
through the vented plug.
7. Check the oil lever of the reservoir. Add oil if
necessary.
Greenlee / A Textron Company
980 Hydraulic Power Pump

Draining and Flushing the System

Note: Thoroughly clean the pump exterior before
removing the reservoir.
1. Remove the reservoir cover screws.
2. Remove the pump system from the reservoir.
Note: Be careful not to damage the cover gasket,
inlet strainer or relief valve when removing the
pump.
3. Clean the interior of the reservoir and fill with clean
kerosene. Do not use solvents. Rinse the inlet
strainer.
4. Place the pump system into the reservoir and
replace the four cover screws.
5. Connect a hose to the pump as usual. Insert
the other end of the hose into the pump reservoir
at fill hole.
6. Run the pump for several minutes. While the
pump is running, rotate the control lever between
MANUAL RELEASE and AUTO RELEASE several
times. Start and stop the pump several times to
cycle the pilot-operated valve.
7. Remove the hose and remove the pump assembly
from the reservoir. Drain and clean the reservoir
interior. Allow the reservoir to dry. Drain the hose.
8. Reassemble the pump system.
9. Refill reservoir as instructed under the Adding Oil
instructions in this section.
Motor Maintenance
Disconnect the pump from the power source before
servicing or cleaning the motor. The exposed motor
bearings and shaft should be cleaned periodically.
Lubrication
Lubricate the motor according the motor manufacturer's
instructions, which are on the nameplate or the terminal
box cover.
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4455 Boeing Dr. • Rockford, IL 61109-2988 USA • 815-397-7070