Smiths Graseby 3200, Technical & Service Manual

Page: 36 / 117

Smiths Medical International Ltd.
3200 Service Manual Issue 5 (August 2004)
2 — 14
If the occlusion thrust requires adjustment, the following procedures must be completed:
1. Switch the pump off and disconnect the AC supply.
2. Take the casing apart (see page 2-11).
3. If necessary, rotate the leadscrew to reveal the grub screw located on the occlusion
adjusting nut. Loosen the grub screw with a 1.5 mm hexagonal key.
4. Alter the setting of the occlusion adjusting nut as necessary. One full turn of the
adjusting nut using a 50\60 ml syringe gives approximately 2.73 kg (369 mmHg) of
adjustment.
Rotating the adjusting nut to decrease the tension on the leadscrew spring. This decreases the
pump's occlusion setting.
Rotating the adjusting nut to increase the tension on the leadscrew spring increases the
pump's occlusion setting.
5. Tighten the grub screw to a torque of 15 ± 2cNm.
6. Temporarily assemble the two halves of the pump, being careful not to trap any
leads.
7. Complete a thrust check (see page 2-13).
8. To obtain the thrust required it may be necessary to repeat steps (2) to (7) above.
9. Assemble of the pump casing (see page 2-11).
10. Complete tests No. 9 and 10 detailed in the functional test procedures (see page 6-3).
Occlusion thrust
Thrust
adjustments