5-M12
ZD21N-EC, ZD21-EC, ZD28-EC, WSM
ELECTRICAL SYSTEM
[3] EASY CHECKER
To check the conditions of tractor easily before and during operation, easy checker combination of lamps on the
easy checker board is provided.
■ Indication Items
(1) Oil Pressure Lamp
When the engine oil pressure is low, this lamp
illuminates.
(2) Charge Lamp
When the charging system is not functioning properly,
this lamp illuminates.
(3) Pre-heat Indicator Lamp
When the key switch is in the “Pre-heat” position, the
pre-heat indicator lamp illuminates.
W1013747
■ Oil Pressure Switch
While oil pressure is high and the force applied to the
diaphragm (2) is larger than the spring tension, the
terminal contact (1) is open separated from the body
contact (3). If the pressure drops below approx. 49 kPa
(0.5 kgf/cm
2
, 7.1 psi), the contact closes.
W1013868
(1) Terminal Contact
(2) Diaphragm
(3) Body Contact
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