Relief Valve Adjustment - Enerpac EHF-65 Manuel D'instructions

Figure 8b
1. Position lever on 4-way valve to select function as
follows:
(A) Flow to Port "A"; port "B" returns flow to the
reservoir
(N) Neutral; ports "A" and "B" are blocked
(B) Flow to port "B"; port "A" returns flow to the
reservoir
2. Operate pump to perform work.
3. Change valve positions as needed.
WARNING:
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.
air
Figure 8c
Operate double-acting

5.6 Relief Valve Adjustment

All pumps contain a factory set relief valve to prevent
over-pressurization of the system. Lower pressure
settings can be obtained. Contact your Authorized
Enerpac Service Center.
6.0 AIR REMOVAL
Removing air from the hydraulic system will help the
cylinder to advance and retract smoothly (see figure 9).
6.1 Pump With Single-Acting Cylinder (A)
1. Vent pump reservoir (for vented pumps only) and
close release valve.
2. Position pump at higher elevation than cylinder.
3. Position cylinder with the plunger end down (up if
using pull cylinder). See Figure 9 below.
4. Operate pump to fully extend the cylinder (retract
if using pull cylinder).
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. Repeat the above steps as necessary.
7. Add oil if necessary. See page 7.
8. Return vent/fill cap to operating position.
6.2 Pump With Double-Acting Cylinder (B)
1. Vent pump reservoir (for vented pumps only).
2. Position pump at higher elevation than cylinder.
3. Put cylinder in horizontal position with ports up.
See Figure 9.
4. Fully advance and retract the cylinder 2 to 3 times.
5. Repeat the above steps as necessary.
6. Add oil if necessary. See page 7.
7. Return vent/fill cap to operating position.
7.0 MAINTENANCE
Use only Enerpac hydraulic oil with these pumps to
promote long pump life and to protect your warranty.
Viton and EPR seal kits are available for some hand
pumps. Contact your Enerpac representative for more
information on these products and their applications.
air
Figure 9
6