MAC TOOLS MW250 Betriebsanleitung PDF herunterladen (Seite 145)

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101

TM 5-4310-452-14

4-41. OIL PRESSURE SWITCH REPLACEMENT.

This Task Covers:

a. Removal c. Installation

b. Inspection

Initial Setup:

Equipment Conditions: Tools/Test Equipment:

• Engine off. • General mechanic's tool kit

• Battery cables disconnected (see paragraph Multimeter

4-57) .

• Left door assembly open.

a. REMOVAL

NOTE

Identify and tag electrical leads before removal.

1. Disconnect 2 electrical leads (2) from oil pressure switch terminals (3).

2. Unscrew and remove oil pressure switch (1) from elbow (4).

b. INSPECTION

1. Connect oil pressure switch (1) to a controlled

pressure source. Connect multimeter terminal leads

to oil pressure switch terminals (3).

2. Apply pressure slowly from controlled source to oil

pressure switch (1) while monitoring multimeter. Oil

pressure switch should close at 12 psi (83 kPa) and

indicate continuity on multimeter.

3. Decrease pressure slowly. Oil pressure switch (1)

should open at 8 psi (55 kPa) and multimeter should

indicate no continuity (infinite ohms).

4. If oil pressure switch (1) does not close or open as

indicated, replace oil pressure switch.

c. INSTALLATION

1. Install oil pressure switch (1) in elbow (4).

2. Connect 2 electrical leads (2) to oil pressure switch terminals (3).

TA505471

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