Operation Manual

Job Card No.:
Engine:
Filing No.:
Pressure Switch (Oil, Water, Air)
Inspection/Testing/Servicing
0178-48-10 1190
Inspection / Testing
Inspect and test the switch for proper functioning
Pressure switches are available for the follo-
wing media: lube oil, fuel, raw water, fresh
water, injector coolant, control (pilot) air, star-
ting and charge air pressure.
Settings are indicated on the switch in bar (kp/
cm2). Check whether setting is to fix minimum
(dropping) or maximum (rising) limits. (Termi-
nal 212 / 212 always for rising function).
Job:
Clean housing (1) externally. Check that all bolts/
screws and stuffing box screwing (2) are tight. Be
sure no lead can chafe. Close cock (3). Unscrew cap
nut (4) and connect testing hose. Connect test gauge
to hose flange. Subject switch to a higher working
pressure by a commercial test pump. Check that
switch trips as the pressure falls or rises (depending
on setting and application). The test gauge indicates
the prevailing working pressure. Compare actual
tripping point (e.g. for release of an alarm) to the
preset tripping point (see Section 3.3).
Servicing
Setting the trip point
For altering the setting (trip point), loosen fixing
screw (6) and turn adjusting screw; clockwise raises
pressure, counterclockwise reduces pressure. As
the desired setting is obtained, lock adjusting screw
(7) by fixing screw (6).
Adjusting screws have RH thread.
The integral microswitches are of the single-
pole quick-action type and must never be
removed. Nor must the sensor retaining
screws be slackened or removed. Be sure to
replace defective pressure switches as a
complete unit.
11.01.02
S/BVM 628
Tools:
- Standard tools,
- testing gauge,
- setting mandrel
- Testing hose with standard test flange
(Section 1.8)
- Commercial test pump
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