Trimble GCS900 - 6.3 Voltage protection diode

Welding andFitting Tasks 6
l Always weld lengthwise along the edges of the mounting bracket.
l Never weld within 75mm (3inches) of an existing weld.
l After welding, make sure that you apply rust-prevention paint to:
the weld
any bare-metal surface
ATTENTION — Do not weld on or drill into any part of the machine’s Roll Over Protection
Structure (ROPS) as this could weaken its structural integrity
6.3 Voltage protection diode
1. Select a grounding point for the voltage protection diode cable (P/N121022).
Make sure that:
there is a guaranteed current path to the ground point of the battery. The
best locations are the machine frame or a plate welded directly to the
machine frame.
the cable reaches the grounded negative terminal of the battery. The
grounded terminal is the terminal that connects to the master disconnect
switch.
2. Connect the cable to the grounding point. Use the provided washer and nut to
secure the diode to one of the following:
A hole in the machine frame. For thin metal, drill a 9.525mm (0.375in)
hole; for thick metal, drill an 8.43mm (0.332in) hole and then tap the hole
with a
3
/
8
– 24 tap.
The supplied square block (welded directly to the machine frame).
Note – To ensure that the diode comes in complete contact with the metal
surface, remove any existing paint. To keep the mounting surface from
rusting and the diode from loosening, make sure that you apply rust
prevention paint after you have secured the diode.
3. Torque the nut to:
14N·m (125lb-in) without lubricant
12.5 N·m (110lb-in) lubricated
4. Use the provided nut to connect the lug end of the voltage protection diode
cable to the grounded negative(–) terminal of the battery.
5. Verify that all wire connections are correct and tight.
6. Replace the battery isolation master key. Turn the key to the ON position.
GCS900 Grade Control System for Excavators Installation Manual 43