Enerpac MS-Series pumps - Manual (Page 4)

3.3 Models P-462 and P-464
Figure 3 and the table below show the main features
of hand pump models P-462, for use with single-
acting cylinders, and P-464, for use with double-
acting cylinders.
Figure 3, Models P-462, P-464
3.4 Models P-25, P-50, and P-51
Figure 4 shows hand pump models P-25 and P-50,
both of which are equipped with a handle that
operates in both directions. Figure 5 shows the P-51
hand pump. The main components of these pumps
are listed in the table below.
Figure 4, Models P-25 and P-50
Figure 5, Model P-51
4.0 INSTALLATION
4.1 Connecting the Pump
1. Thread hose into pump outlet. Use 1 1/2 wraps of
Teflon tape (or suitable thread sealant) on hose
fitting, leaving the first complete thread free of tape
to ensure that tape does not shed into hydraulic
system, causing damage. Trim loose ends.
2. Install a pressure gauge in-line from the pump for
added safety and better control.
3. Connect the hose(s) to your cylinder or tool.
NOTE: For single-acting cylinders, connect one
hose from the pump to the cylinder. For double-
acting cylinders, connect two hoses. Connect
one hose from the pressure port of the pump to
the pressure port of the cylinder. Connect another
hose from the retract port of the pump to the
retract port of the cylinder.
4.2 Pump Venting
See table below to determine if your pump should be
operated with a vented or non-vented reservoir.
Vented pumps provide slightly better performance.
For pumps with nylon reservoir, turn vent/fill cap 1/4
turn counter-clockwise to vent. For other pumps, see
decal on pump. Close vent prior to transporting
pump to prevent oil leakage. P-80, P-801, and P-84
are vented by turning the valve counterclockwise. To
close the vent, turn the valve clockwise.
4.3 Pump Position
See table below to determine the correct operating
position for your pump, horizontal or vertical. The P-80,
P-801, and P-84 cannot be vented when operated vertically.
OPERATING POSITION
EHF-65 . . . . . . . . . either
P-18 . . . . . . . . . . . either
P-25 . . . . horizontal only
P-39, 1003 . . . . . . either
P-50 . . . . horizontal only
P-51 . . . . horizontal only
P-80, 1006 . . . . . . either
P-84 . . . . . . . . . . . either
P-141, 1001 . . . . . either
P-142, 1002 . . . . . either
P-142AL . . . . . . . . either P-202 . . . . . . . . . . either
P-391, 1004 . . . . . either
P-77 . . . . . . . . . . . either
P-392, 1005 . . . . . either
P-392AL . . . . . . . . either
P-462 . . . horizontal only
P-464 . . . horizontal only
P-801 . . . . . . . . . either
P-802 . . . . . . . . . . either
P-842 . . . . . . . . . . either
VENTING OPTIONS
EHF-65 ..........non-vented
P-18 ...............non-vented
P-25 ........................either
P-39, 1003 .....non-vented
P-50 ........................either
P-51 ......................vented
P-80, 1006 ..............either
P-84 ........................either
P-141, 1001 ............either
P-142, 1002 ............either
P-142AL.........non-vented P-202 ......................either
P-391, 1004 ............either
P-77 ......................vented
P-392, 1005 ........... either
P-392AL ................vented
P-462 ....................vented
P-464 ....................vented
P-801 .............non-vented
P-802 ......................either
P-842 ......................either
Table 4 and 5
Fig. 4 & 5 P-25 P-50 P-51
A Release Valve Release Valve Release Valve
B 1/4 NPTF 1/4 NPTF 1/4 NPTF
Outlet Port Outlet Port Outlet Port
C Vent/Fill Cap Vent/Fill Cap Vent/Fill Cap
Table 3
Fig. 3 P-462 P-464
A 3-Way 2-Position Valve 4-Way 3-Position Valve
B 3/8 NPTF Outlet Port 3/8 NPTF Outlet Port
C Vent/Fill Plug Vent/Fill Plug
D Handle Clip Handle Clip
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