JLG 660SJ ANSI Service Manual - Manual (Page 42)

SECTION 2 - GENERAL
2-6 – JLG Lift – 3120718
2.6 WELDING ON JLG EQUIPMENT
NOTE: This instruction applies to repairs, or modifications to
the machine and to welding performed from the
machine on an external structure, or component,
Do the Following When Welding on JLG
Equipment
• Disconnect the battery.
• Disconnect the moment pin connection (where fitted)
• Ground only to structure being welded.
Do NOT Do the Following When Welding on
JLG Equipment
• Ground on frame and weld on any other area than the
chassis.
• Ground on turntable and weld on any other area than
the turntable.
• Ground on the platform/support and weld on any other
area than the platform/support.
• Ground on a specific boom section and weld on any
other area than that specific boom section.
• Allow pins, wear pads, wire ropes, bearings, gearing,
seals, valves, electrical wiring, or hoses to be between
the grounding position and the welded area.
FAILURE TO COMPLY WITH THE ABOVE REQUIREMENTS MAY
RESULT IN COMPONENT DAMAGE (I.E. ELECTRONIC MODULES,
SWING BEARING, COLLECTOR RING, BOOM WIRE ROPES ETC.)
2.7 APPLYING SILICONE DIELECTRIC
COMPOUND TO ELECTRICAL
CONNECTIONS
Silicone Dielectric Compound must be used on all electri-
cal connections for the following reasons:
• To prevent oxidation at the 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
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
resistance at the connection, eventually causing cir-
cuit 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 con-
nectors come together. Any other joints (around
strain reliefs, etc.) where water could enter the con-
nector 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 the battery boxes and bat-
tery chargers should have silicone grease applied to
the contacts only.
NOTE: Curing-type sealants might also be used to prevent
shorting and would be less messy, but would make
future pin removal more difficult.