Enerpac ATP-Series - Manual (Page 5)

5
4.4 Pump Priming (air bleeding)
IMPORTANT: New pumps MUST be primed BEFORE initial start-
up. Perform priming procedure as described in the following
steps. Refer to fi gures 4 through 7.
1. Be sure that hydraulic reservoir is fi lled with the correct oil
and that reservoir outlet valve is open. Refer to Section 4.1.
2. Be sure that the air-shutoff valve is in the CLOSED position
and that the oil return-to-tank valve is open.
3. Loosen the reservoir fi ller cap about one-half turn to provide
air venting. Venting is required for proper operation.
E RELEASE VALVE
OT CLOSE WITH
DUE FORCE.
EN SLOWLY
OPEN
(pump on)
CLOSED
(pump off)
Figure 4, Air-Shutoff Valve
PRESSURE RELEASE V ALVE
DO NOT CLOSE WITH
UNDUE FORCE.
OPEN SLOWLY
OPEN
(pressure release
to tank)
CLOSED
(oil fl ow to tool)
Figure 5, Oil Return-to-Tank Valve
4. Connect air supply hose to the pump air inlet connection.
5. While air-shutoff valve remains CLOSED, activate air
source and check the air pressure gauge. If any pressure is
indicated, turn air pressure regulator knob counter-clockwise
as required, until gauge indicates zero [0] psi/bar.
• Pull up to turn.
• Push down to lock.
Figure 6, Air Pressure Gauge and Regulator
6. Connect one end of a 3 foot [1 m] long hydraulic hose to the
pump oil outlet connection.
7. Install an open-ended quick disconnect fi tting on other end
of hose.
8. Unscrew the reservoir fi ller cap. Place hose end with open-
ended fi tting inside reservoir. This will allow oil return during
priming.
9. Close the oil return-to-tank valve. Move the air-shutoff valve
to the OPEN position.
10. Using the air pressure regulator, SLOWLY increase air
pressure from 0 psi to 10-15 psi [0,68 - 1,0 bar] to start
pump operation.
11. Verify that oil is returning to the reservoir through the hose.
Increase air pressure to 40 psi [2,75 bar] until all air is purged
from the system (no bubbles visible in return oil stream).
12. Move the air-shutoff valve back to the CLOSED position.
The pump will stop.
13. Turn the air pressure regulator knob counter-clockwise until
zero [0] psi/bar is indicated on the air pressure gauge.
14. Open the oil return-to-tank valve to relieve any residual
hydraulic pressure. Verify that hydraulic pressure gauge
indicates zero [0] psi/bar.
.
Figure 7, Hydraulic Pressure Gauge
15. Remove the 3 foot [1 m] long oil return hose from the
reservoir. Reinstall the reservoir fi ller cap.
16. Disconnect the oil return hose from the pump oil outlet
connection.