Instruction Manual
P-2800 & P-2800D Hand Pumps - V1.1 www.durapac.com
Page 6 of 12
Note
: To reduce handle effort at high pressure, take short strokes. Maximum leverage
is obtained in the last 5° of stroke. For best performance, operate pump handle at
moderate speed during the high flow first stage. Rapid handle speed in the first stage
will prevent the pump from delivering full volume of oil.
5.3
Single-Acting Applications with 2 Way Valve
Figure 2 – 2 Way valve positioning
5.3.1
Shift valve handle to the open position (ADV).
5.3.2
Operate pump handle to deliver hydraulic power to the system. Pressure will be
maintained until the valve is shifted.
5.3.3
To allow oil to return to the reservoir, shift valve handle to closed position (180
o
- RET).
5.4
Double-Acting Applications with 4 Way Valve
WARNING: Operate double-acting cylinder only when both hoses are connected to the
pump. If one coupler is left unconnected, high pressure will build behind the coupler
which could cause personal injury and/or equipment damage
Pumps with 4-way control valves are designed to operate double-acting cylinders.
Figure 3 – 4 Way valve positioning
5.4.1
Position lever on 4-way valve to select function as follows:
(A) Flow to Port "A"; port "B" returns flow to the reservoir
(T) Neutral; ports "A" and "B" are blocked
(B) Flow to port "B"; port "A" returns flow to the reservoir
5.4.2
Operate pump to perform work.
5.4.3
Change valve positions as needed.
