JLG 450A_AJ Series II Service Manual - Manual (Page 419)

SECTION 7 - BASIC ELECTRICAL INFORMATION & SCHEMATICS
3121180 – JLG Lift – 7-3
Current Measurement
• Set up meter for expected current range.
• Connect meter leads to correct jacks for current
range selected.
• If meter is not auto ranging, set it to correct range
(See multi meter’s operation manual).
• Use firm contact with meter leads.
7.2 APPLYING SILICONE DIELECTRIC
COMPOUND TO ELECTRICAL
CONNECTIONS
NOTE: Do NOT apply dielectric grease to the following con-
nections:
• Main Boom Rotary sensor connections (on Celesco
Sensor).
• LSS Modules connections,
• Deutz EMR 2 ECM connection.
Silicone Dielectric Compound must be used on all electri-
cal connections except those listed 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
conductivity between pins when wet.
Use the following procedure to apply Silicone Dielectric
Compound to the electrical connectors. This procedure
applies to all plug connections not enclosed in a box. Sili-
cone 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
inside of connector before assembly. This is most
easily achieved using a syringe.
NOTE: Over a period of time, oxidation increases electrical
resistance at the connection, causing circuit failure.
2. To prevent shorting, silicone grease must be packed
around each wire where they enter the connector
housing. Also, silicone grease must be applied at
the joint where male and female connectors come
together. Any other joints (around strain reliefs, etc.)
where water could enter, connector should also be
sealed.
NOTE: This condition is especially common when machines
are pressure washed since 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 are less messy, but make future pin
removal more difficult.
Figure 7-4. Current Measurement (DC)