Cordless Drill User Manual

Service and Repair Manual

Model 840M

ELECTRICAL TESTING

Electrical test

Before assemby all electrical parts MUST be checked for safety, and that they conform to speciﬁ cation.

Testing the Armature (Flash Testing)

A Armature shaft to lamination pack 1500 Volts (min)

B Lamination pack to commutator 1200 Volts (min)

C Armatuure shaft to commutator 3000 Volts (min)

ELECTRICAL PERFORMANCE TEST READINGS

CLUTCH SLIP

Measured on disassembly/assembly 40/50ft lbs 47/61Nm. (Non Electrical Test)

Note: On all test readings + or -5% of ﬁ gures shown is acceptable.

840M

MODEL

110V 120V 220V-240V

ARMATURES

.440/.506 Ohms .440/.506 Ohms 1.283/1.477 Ohms

FIELD COILS

840M

110V 120V 220V-240V

4.5/6.5 Amps 4.5/6.5 Amps 2.9/4.4 Amps

.349/.401 Ohms .349/.401 Ohms 1.339/1.54 Ohms

PERFORMANCE

110V 120V 220V-240V

Running No Load