Instruction Manual
P-2800 & P-2800D Hand Pumps - V1.1 www.durapac.com
Page 8 of 12
Figure 4 – Bleeding Air from the System
6.2.1
Pump With Single-Acting Cylinder (A)
6.2.1.1
Repeat Steps 6.1.1 to 6.1.3 (above), if required.
6.2.1.2
Position pump at higher elevation than cylinder.
6.2.1.3
Position cylinder with the plunger end down (up if using pull cylinder).
6.2.1.4
Operate pump to fully extend the cylinder (retract if using pull cylinder).
6.2.1.5
Open release valve to retract cylinder (extend if a pull cylinder). This will
force the trapped air to move up to the pump reservoir.
6.2.1.6
Repeat the above steps as necessary.
6.2.1.7
Recheck oil level after removing air.
6.2.1.8
Return vent/fill cap to operating position.
6.2.2
Pump With Double-Acting Cylinder (B)
6.2.2.1
Repeat Steps 6.1.1 to 6.1.3 (above), if required.
6.2.2.2
Position pump at higher elevation than cylinder.
6.2.2.3
Put cylinder in horizontal position with ports up.
6.2.2.4
Fully advance and retract the cylinder 2 to 3 times.
6.2.2.5
Repeat the above steps as necessary.
6.2.2.6
Recheck oil level after removing air.
6.2.2.7
Return vent/fill cap to operating position.
6.3
Changing Hydraulic Fluid
For best results, change fluid once a year or every 300 hours of use
6.3.1
Repeat Steps 6.1.1 to 6.1.2 (above).
6.3.2
Pour used fluid into a sealable container.
6.3.3
Repeat Steps 6.1.3 to 6.1.5 (above).
6.3.4
Dispose of fluid in accordance with local regulations.
6.4
Lubrication
To extend pump life and improve performance, lubricate the beam pin (A), cross pin
(B), and piston head (C) regularly, using roller bearing grease.
