Mestra R-030350 Manual Del Usuario página 9

The R-030350 is a practical hydraulic press, with maximum power level 15.2 tonnes (rated, 9.5
tonnes), specially designed for use in the manufacture of muffles for dental prostheses. It consists of the
following:
•
Cast aluminium base.
•
Portico: two steel columns resting on the aluminium base.
•
Hydraulic circuit.
An easy-to-read pressure gauge has been provided to allow us to read off thrust pressure at any time.
INSTRUCTIONS FOR USE
1. With the locking screw (B) open, put the muffle(s) between the plates (E) taking care to centre it/them
properly.
2. Bring up spindle (A) until it touches the muffle(s), close up the screw (B) and start pumping.
3. The pressure gauge will not stabilize until the muffle(s) is/are compacted and all excess resin is
squeezed out. When the pressure gauge needle is steady, optimum pressing has been achieved.
4. To remove the muffle(s) from the press, unscrew the locking screw (B) so that the bottom plate (E) is
lowered by the springs, and the unit will be ready for the next pressing.
Every 50 Bars (725 psi) a pressure of 1,900 kg is obtained. Thus at 100 bars (1450 psi) 3,800 kg is
obtained, and at 200 bars (2900 psi) 7,600 kg is obtained. The maximum is 400 bars (5801 psi) or
15,200 kg of pressure. We do not advise going this far, as the pressure gauge may suffer mechanical
damage at this level, and the service life of all components of the press and the muffles may be reduced.
The maximum recommended pressure is 250 bars (3625 psi), red mark on pressure gauge.
Normal working pressure is 150 - 250 bars (2175 – 3625 psi).
If more liquid is needed use only EXTRA (SAE 10) oil. No other liquids may be used under any
circumstances.
CHANGING SEALS AND JOINTS
The MESTRA hydraulic press has been designed for many years of trouble-free service life with little
maintenance. We have, however, indicated below how to dismantle it in case of considerable pressure
loss, though we recommend that in case of malfunction it be returned to our workshops, where proper
repair is guaranteed. Before beginning to dismantle the press in case of malfunction or pressure loss,
please check the following points:
1. If the press does not build up pressure, check that it has oil, and top up if necessary.
2. Check that the locking screw (2) is properly tightened.
3. Check that the pressure gauge is not leaking through the thread. If it is, tighten it with a 14 mm
wrench. If it is leaking elsewhere, change it.
As in all hydraulic systems, the oil retaining elements used are seals and retainers. We shall now explain
how to replace these two items.
The MESTRA hydraulic press has two retainers and an O-ring, marked 14, 15 and 16 on the sketch.
These are all top quality components made specially for hydraulic systems.
GB
English
9