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SEBU9064-08
Maintenance
Recommendations
System Pressure Release
Coolant System
Pressurized system: Hot coolant can cause seri-
ous burn. To open cap, stop engine, wait until ra-
diator is cool. Then loosen cap slowly to relieve
the pressure.
Ensure that the power supply is isolated before any
service or repair is performed.
To relieve the pressure from the coolant system, turn
off the engine. Allow the cooling system pressure cap
to cool. Remove the cooling system pressure cap
slowly in order to relieve pressure.
Fuel System
To relieve the pressure from the fuel system, turn off
the engine.
Engine Oil
To relieve pressure from the lubricating system, turn
off the engine.
Welding on Engines with
Electronic Controls
NOTICE
Because the strength of the frame may decrease,
some manufacturers do not recommend welding onto
a chassis frame or rail. Consult the OEM of the equip-
ment or your Perkins dealer regarding welding on a
chassis frame or rail.
Correct welding procedures are necessary to avoid
damage to the engines ECM, sensors, and
associated components. When possible, remove the
component from the unit and then weld the
component. If removal of the component is not
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possible, the following procedure must be followed
when you weld on a unit equipped with an Electronic
Engine. The following procedure is considered to be
the safest procedure to weld on a component. This
procedure should provide a minimum risk of damage
to electronic components.
Do not ground the welder to electrical components
such as the ECM or sensors. Improper grounding
can cause damage to the drive train bearings, hy-
draulic components, electrical components, and oth-
er components.
Clamp the ground cable from the welder to the com-
ponent that will be welded. Place the clamp as close
as possible to the weld. This will help reduce the pos-
sibility of damage.
Note: Perform the welding in areas that are free from
explosive hazards.
1. Stop the engine. Turn the switched power to the
OFF position.
2. Ensure that the fuel supply to the engine is turned
off.
3. Disconnect the negative battery cable from the
battery. If a battery disconnect switch is provided,
open the switch.
4. Disconnect all electronic components from the
wiring harnesses. Include the following
components:
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• Electronic components for the driven
equipment
• ECM
• Sensors
• Electric operated fuel pump
• Electronically controlled valves
• Relays
• Aftertreatment ID module
Do not use electrical components (ECM or ECM sen-
sors) or electronic component grounding points for
grounding the welder.
Maintenance Section
Maintenance Recommendations
NOTICE
NOTICE
65
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