DeWalt D25900K Service Manual

Page 63 of 63
Fault finding.
Unit Lacks Power. Worn O-Rings on the Piston and Cylinder
Low Motor Speed, check No Load Amps
Worn Piston or Cylinder.
Faulty Electronics.
Motor Speed incorrect Armature / Field faulty. Check No Load Amps
Faulty electronics
Fan Loose on Armature Shaft ( motor running to fast) .
Magnetic ring missing from fan (motor running to fast).
Unit will not run. Brushes worn.
Electronics faulty.
Switch actuator rod not connected.
Switch actuator broken.
RUN TEST DATA.
No Load amps. At Max Speed .
Min Max Volts.
3.2 5.2 230/240
7.0 8.5 115/120
Flash Test with switch on. 4000v for 230/240v Double insulated units.
1500v for 120v unit with Earth.

DeWalt D25900K Specifications

General

Input power	1500 W
Power source	AC
AC input voltage	230 V
AC input frequency	50 Hz
Impact rate	2040 bpm
Impact energy (max)	25 J
Chuck type	SDS Max

Weight and Dimensions

Weight	9800 g