OPG1™ Operation and Maintenance Manual
Page 31
©2000
DH Instruments, Inc
.
4.4.2
INTERNAL PURGE OF HYDROPNEUMATIC PUMP
The hydropneumatic pump internal purge procedure is only required if the regular purge
procedure fails (see Section 2.4.3.1) and a syringe is not available to perform the injection
priming procedure (see Section 4.4.1).
To purge the hydropneumatic pump internally, proceed as follows (see Figure 10):
1. Hydraulic Output Pressure Connection
Figure 10.
Hydropneumatic Pump
Verify that there is oil in the tank.
Back
off
DRIVE SET regulator
to zero.
Position the OPG1 so that you can access the hydraulic output pressure connection (1)
of the hydropneumatic pump while keeping the OPG1 in its normal, horizontal
operating position. This is accomplished by placing either end on separate tables and
accessing the pump from beneath OPG1 or by slightly lifting the front of the OPG1.
Open
the
INLET valve
fully.
Use a wrench to turn the hydraulic output pressure connection gland (1) 1/8 turn CCW.
This cracks the connection so that output oil from the pump can escape through the
safety weep hole.
Slightly
adjust
DRIVE SET regulator
CW until the pump starts cycling.
Allow the pump to cycle until clear, bubble free oil flows regularly from the weep hole.
If this does not occur, the pump may require service. Contact your
DHI
Authorized
Service Provider (see Section 6.1).
Retighten the hydraulic output pressure connection (1) by turning the gland nut
approximately 1/8 turn CW.
Go to Section 2.4.3.1 and proceed with the normal purge procedure.