4
6. Control flow by operating manual valve. (See section 5.1 for
specific valve configuration instructions)
Figure 6,
5.1 Manual Valve
Operation
VM32 (See Fig. 7)
1.
Advance
2.
Retract (Neutral)
VM33, VM33L, VM43,
VM43L (See Fig. 8)
1.
Advance
2.
Retract
3.
Neutral
5.2 Relief Valve Adjustment
Z-Class pumps are equipped with one user adjustable relief
valve (see Figure 9.) It can be adjusted as follows:
1.
Install a gauge on the pump.
2.
Start the pump to allow the oil to warm.
3.
Loosen the set screw locking nut.
4.
Shift the control valve and build pressure in the system.
Using an Allen wrench, turn the set screw counter-clockwise
to decrease pressure and clockwise to increase pressure.
NOTE:
To get an accurate setting, decrease the pressure to
a point below the final setting and then slowly increase the
pressure until it reaches the final setting.
5.
Tighten the locking nut when the desired pressure is set.
6.
Shift the control valve to the neutral position, allowing the
system pressure to return to 0 psi.
7.
Recheck the final pressure setting by shifting the control
valve and pressurizing the system.
Figure 9
6.0 MAINTENANCE
Frequently inspect all system components for leaks or damage.
Repair or replace damaged components.
6.1 Check Oil Level
Check the oil level of the pump prior to start-up, and add oil, if
necessary, by removing the fill port cap. Always be sure cylinders
are fully retracted before adding fluid to the reservoir. See Figure 2.
6.2 Change Oil and Clean Reservoir
Enerpac HF oil is a crisp blue color. Frequently check oil condition
for contamination by comparing pump oil to new Enerpac oil. As
a general rule, completely drain and clean the reservoir every 250
hours, or more frequently if used in dirty environments.
NOTE:
This procedure requires that you remove the pump from
the reservoir. Work on a clean bench and dispose of used oil
according to local codes.
1.
Unscrew the 13 bolts holding the coverplate to the reservoir
and lift the pump unit out of the reservoir. Be careful not to
damage the filter screen.
2.
Pour all oil out of the reservoir.
3.
Thoroughly clean the reservoir and reservoir magnet with a
suitable cleaning agent.
4.
Remove the pick-up filter screen for cleaning. (Do not pull on
the screen or the bottom of the intake to avoid possible
damage.) Clean the screen with solvent and a soft brush.
Reinstall.
5.
Reassemble the pump and reservoir, installing a new
reservoir gasket.
6.
Fill the reservoir with clean Enerpac hydraulic oil. The
reservoir is full when oil level is in middle of the sight gauge
(see figure 4).
6.3 Changing the Filter Element (optional)
A return line filter may be ordered as an accessory to the pump. The
filter element should be replaced every 250 hours, or more
frequently in dirty environments. The filter manifold is equipped with
a 25 psi (1,7 bar) bypass to prevent over pressure rupture if filter
plugging occurs. Filter element replacement part number is PF25.
6.4 Check Engine Operation
See the Honda or Briggs & Stratton Owner's Manual that was
supplied with your pump. Follow the Maintenance Schedule to
keep the engine in proper operating condition.
A
B
Key
Throttle
Oil Level
Sight Gauge
Relief valve body (DO NOT TURN relief
valve body.)
Locknut
Set screw
1
2
Tank
Pressure
Figure 7
3 - In Use
1
3
2
A
B
Figure 8
