SC-4
BATTERY
lRemove the cell plug using a suitable tool.
lAdddistilledwateruptotheMAXlevel.
Sulphation
A battery will be completely discharged if it is left unattended
for a long time and the specific gravity will become less than
1.100. This may result in sulphation on the cell plates.
To determine if a battery has been “sulphated”, note its voltage
and current when charging it. As shown in the figure, less cur-
rent and higher voltage are observed in the initial stage of
charging sulphated batteries.
A sulphated battery may sometimes be brought back into ser-
vice by means of a long, slow charge, 12 hours or more, fol-
lowed by a battery capacity test.
SPECIFIC GRAVITY CHECK
1. Read hydrometer and thermometer indications at eye level.
2. Convert into specific gravity at 20°C(68°F).
Example:
lWhen electrolyte temperature is 35°C(95°F) and specific gravity
of electrolyte is 1.230, converted specific gravity at 20°C(68°F)
is 1.240.
lWhen electrolyte temperature is 0°C(32°F) and specific gravity
of electrolyte is 1.210, converted specific gravity at 20°C(68°F)
is 1.196.
MEL043F
SEL709E
MEL042FA
SEL007Z
SC-34
SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
PFP:00030
BatteryEKS0031Q
StarterEKS0031R
AlternatorEKS0031S
Applied modelQR20 engine
YD22 engine
Standard Option
Type 55D23L 80D26L 110D26L
Capacity V-AH 12-48 12-55 12-70
Ty p eS114-844 M0T87081 M8T71471
HITACHI make MITSUBISHI make
Reduction
Applied model QR20 engine YD22 engine
System voltage V12
No-loadTerminal voltage V 11.0
Current A Less than 90 Less than 90 Less than 145
Revolution rpm More than 2,700 More than 2,500 More than 3,300
Minimum diameter of commutator mm (in) 28.0 (1.102) 28.8 (1.134) 31.4 (1.236)
Minimum length of brush mm (in) 10.5 (0.413) 7.0 (0.276) 11.0 (0.433)
Brush spring tension N (kg, lb) 16.2(1.65, 3.64)15.0 - 20.4(1.5 - 2.1, 3.4
-4.6)26.7 - 36.1(2.7 - 3.7, 6.0
-8.2)
Clearance between bearing metal and armature
shaft mm (in)Less than 0.2 (0.008) —
Clearance “l” between pinion front edge and pinion
stopper mm (in)0.3 - 2.5 (0.012 - 0.098) 0.5 - 2.0(0.020 - 0.079) —
Movement “l” in height of pinion assembly mm (in) — 0.5 - 2.0(0.020 - 0.079)
Ty p eLR1110-713 A3TB0771
HITACHI make MITSUBISHI make
Applied model QR20 engine YD22 engine
Nominal rating V-A 12-110 12-90
Ground polarityNegative
Minimum revolutions under no-load (When 13.5V is
applied) rpmLess than 1,100 Less than 1,300
Hot output current (When 13.5V is applied) A/rpmMore than35/1,300
More than91/2,500
More than110/5,000More than29/1,300
More than76/2,500
More than88/5,000
Regulated output voltage V 14.1 - 14.7
Minimum length of brush mm (in) More than 6.0 (0.236) More than 5.0 (0.197)
Brush spring pressure N (g, oz) 1.0 - 3.43 (102 - 350, 3.60 - 12.34) 4.8 - 6.0 (490 - 610, 17.28 - 21.51)
Slip ring minimum diameter mm (in) More than 26.0 (1.024) More than 22.1 (0.870)
Rotor coil resistance at 20°(68°F)W2.31 2.1 - 2.5
