Checking Brush Wear Of Alternator; Checking Rectifier; Checking Ic Regulator - Kubota D1803-CR-E4 Workshop Manual

4. ENGINE
7.53 Checking brush wear of
alternator
Tools required
• Vernier caliper
1. Measure the brush length (A) with a vernier
calipers.
NOTE
• If the measurement is less than the service
limit, replace it.
Service specifi-
cation
Brush length (A)
Service limit
(A) Brush length
2. Make sure that the brush moves smoothly.
NOTE
• If the brush is damaged and not smoothly,
replace it.

7.54 Checking rectifier

Tools required
• Circuit tester
1. Check the continuity across each diode of rectifier
with the resistance range of circuit tester.
NOTE
• The rectifier is correct if the diode in the
rectifier conducts electricity only in one
direction.
Service specifi-
Resistance
cation
4-190
10.5 mm
0.413 in.
8.4 mm
0.33 in.
Less than 1.0 Ω
D1803-CR-E4,D1803-CR-TE4,D1803-CR-TIE4,V2403-CR-E4,V2403-CR-TE4,V2403-CR-TE4BG,V2403-CR-TIE4

7.55 Checking IC regulator

Tools required
• Circuit tester
1. Check the continuity across the B terminal (2) and
the F terminal (1) of IC regulator with the resistance
range of circuit tester.
NOTE
• The IC regulator is correct if it conducts
electricity only in one direction.
Service specifi-
Resistance
cation
(1) F terminal
SERVICING
7. Servicing
Less than 1.0 Ω
(2) B terminal
KiSC issued 12, 2018 A