JLG 450A II Series, Service And Maintenance Manual

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SECTION 7 - BASIC ELECTRICAL INFORMATION & SCHEMATICS
3121290 – JLG Lift – 7-3
Current Measurement
• Set up meter for expected current range
• Be sure to connect meter leads to correct jacks for
selected current range
• If meter is not auto ranging, set it to correct range (See
multi meter’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 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.
3. Anderson connectors for battery boxes and battery
chargers should have silicone grease applied to contacts
only.
NOTE:
Curing-type sealants can also be used to prevent shorting
and would be less messy, but make future pin removal diffi-
cult.
When applied to electrical connections, dielectric grease helps
prevent corrosion of electrical contacts and improper conduc-
tivity between contacts from moisture intrusion. Open and
sealed connectors benefit from application of dielectric
grease.
Dielectric grease shall be applied to all electrical connectors at
the time of connection (except those noted under Exclusions).
Figure 7-4. Current Measurement (DC)