JLG 740AJ, Руководство по обслуживанию и ремонту

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SECTION 7 - BASIC ELECTRICAL INFOR M ATION & SCHE M ATICS
3121160 7-3
Current Measurement
• Set up the meter for the expected current range.
• Be sure to connect the meter leads to the correct jacks
for the current range you have selected.
• If meter is not auto ranging, set it to the correct range.
(See multimeter’s operation manual.)
• Use firm contact with meter leads.
7.3 APPLYING SILICONE DIELECTRIC COMPOUND
TO ELECTRICAL CONNECTIONS
NOTE: This section is not applicable for battery terminals.
JLG P/N 0100048 DIELECTRIC GREASE (NOVAGARD G661) IS THE ONLY MATE-
RIAL APPROVED FOR USE AS A DIELECTRIC GREASE.
NOTE: Do NOT apply dielectric grease to the following connec-
tions:
• Main Boom Rotary sensor connections (on Celesco Sensor).
• LSS Modules connections.
• Deutz EMR 2 ECM connection.
Silicone Dielectric Compound must be used on all electrical
connections except for those mentioned above for the follow-
ing reasons:
• To prevent oxidation at the mechanical joint between male
and female pins.
• To prevent electrical malfunction caused by low level con-
ductivity between pins when wet.
Use the following procedure to apply Silicone Dielectric Com-
pound to the electrical connectors. This procedure applies to
all plug connections not enclosed in a box. Silicone grease
should not be applied to connectors with external seals.
1. To prevent oxidation, silicone grease must be packed
completely around male and female pins on the inside
of the connector prior to assembly. This is most easily
achieved by using a syringe.
NOTE: Over a period of time, oxidation increases electrical resis-
tance at the connection, eventually causing circuit failure.
2. To prevent shorting, silicone grease must be packed
around each wire where they enter the outside of the
connector housing. Also, silicone grease must be
applied at the joint where the male and female connec-
tors come together. Any other joints (around strain
reliefs, etc.) where water could enter the connector
should also be sealed.
NOTE: This condition is especially common when machines are
pressure washed since the washing solution is much more
conductive than water.
Figure 7-4. Current Measurement (DC)