Enerpac ZU4 Classic Manual Del Usuario página 5

5.5 Pressure Gauge Torque Overlay
The pump is supplied with a pressure gauge installed. For your
convenience, torque overlays are provided with each pump. A
torque overlay fi ts over the pressure gauge dial face and easily
converts pressure readings to torque readings (see Fig. 10, View
A). The overlay has imperial units (Ft-Lbs.) on one side and metric
units (Nm) on the other. To change scales simply slip overlay over.
WARNING: Each overlay is sized for a specifi c Enerpac
torque wrench ONLY. Do not use with other wrenches.
5.6 Changing the Overlay
1. Remove the three black wing knobs which hold the front
gauge fl ange in place (see Fig. 10, View B).
2. Remove the front fl ange and overlay (see Fig. 10, View C).
3. Insert new overlay (remember to verify correct overlay to the
Enerpac torque wrench being used) onto the fl ange, aligning the
overlay with the dimples on the back of the fl ange (see Fig. 10,
View D).
4. While holding the overlay behind the fl ange (see Fig. 10, View
C) insert the fl ange onto the knob studs, repositioning the
overlay as needed, and secure knobs fi nger tight (see Fig.
10, View B). The fl ange will press the overlay onto the gauge
and secure it in place. See torque wrench instructions for
amount of pressure required to produce desired torque. Note
that the maximum pressure varies for different wrenches and
accessories.
CAUTION: Refer to torque wrench instructions for
wrench operating procedure.
View A
View C
.
Figure 10, Overlay Installation
5.7 Pressure (Torque) Setting
provide the required torque for your application. Exceeding
required torque will cause equipment damage and may lead to
serious personal injury.
To limit the advance pressure to the torque wrench, adjust the relief
valve as described in the following procedure. See Figure 11.
1.
2.
Note: Relief valve handle will rotate only about two thirds of a full
turn. When rotation stops, pull up on handle to disengage. Then,
reposition and re-engage handle to allow additional adjustment
(as required).
3.
4.
5.
Note: To obtain an accurate setting, always decrease the pressure
to a point below the fi nal setting and then slowly increase the
pressure until the fi nal setting is reached.
6.
7.
8.
View B
View D
5
WARNING: Make these adjustments BEFORE putting
torque wrench on nut or bolt head. The pump pressure
setting may not be above the pressure needed to
Loosen the relief valve locking nut.
Rotate relief valve handle counter-clockwise as required, until
there is little or no resistance when turning. When this occurs,
the valve is at its lowest setting.
Move the pump on-off switch to ON.
Press and hold the pendant "ON/ADV" button. Motor will
start and pressure will begin building in the A-Port advance
circuit.
While continuing to hold down the "ON/ADV" button, SLOWLY
rotate relief valve handle clockwise, until pressure increases
to the desired setting.
Release the "ON/ADV" button to allow the system pressure to
return to the B-port retract setting. The motor will continue to
run.
Press and hold the "ON/ADV" button again to recheck the
advance circuit pressure setting. Verify that the desired
pressure is indicated on the pressure gauge.
After the desired pressure setting has been obtained, tighten
the relief valve locking nut.
Handle
Increase
Figure 11, Relief Valve Adjustment
Pull up to
disengage
Locking Nut
Decrease