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 HYDRAMECHANICAL PROTECTIVE SYSTEM
TROUBLESHOOTING
1. ENGINE WILL NOT START
Cause
Correction
Engine Start-Up Override Not By-
Disconnect drain line (5), See Figure 1. Operate the override (push button
Passing Oil Pressure By Shut- off
switch for electric, push button valve for air) and crank the engine. Oil should
Control Group To Drain
flow from drain line. If not, inspect the solenoid or air operated two-way valve
and the push button switch or push button air valve and lines.
Fuel Shutoff Actuator Stuck In The
Make sure that the start-up override system is operating correctly. Operate the
Shutoff Position
start-up override and crank the engine. Check the governor linkage and fuel
control linkage to see if they are in the run position. If not, check the shutoff
actuator for binding.
2. ENGINE WILL START, BUT SHUTS DOWN WHEN START-UP OVERRIDE IS RELEASED
Cause
Correction
Engine Oil Pressure Is Too Low
Install a pressure gauge in oil line (2) or in port ( I ) behind oil supply line (4),
see Figure 1. Operate the start-up override and start the engine. Engine oil
pressure must be 175 kPa (25 psi) minimum at low idle and 240 kPa (35 psi)
minimum at rated speed.
Engine Oil Pressure
Sensing
Remove the control group from the engine to disassemble and clean
Orifice Plugged
orifice if necessary.
The Oil Return Line Between
Disconnect oil return line (3) at the shutoff control group, see Figure
Diverter Valve And Shutoff Control
1. Crank the engine without using the start-up override valve. Oil should flow
Group Is Plugged
out of the oil return line. Check the oil line for damage and clean or replace as
needed.
Remote Normal
Shutoff
Still
Disconnect oil return line (3) at the shutoff control group, see Figure
Activated
1. Crank the engine without using the start-up override valve. Oil should flow
out of the oil return line. If there is no oil flow and the line is not plugged or
damaged, check the remote normal shutoff system. Make a repair or
replacement of worn or damaged parts and clean the valve if necessary.
Engine Oil Pressure Is Drained
Through Thermostatic Pilot Valve
Check drain side of valve. Replace valve, if flow is present at cranking and
engine coolant temperature is normal.
Engine Oil Pressure Sensing
Portion Of The Control Group Has
Remove cover (6), see Figure 2. Inspect the valve spools in the actuator valve
Malfunctioned
body to make sure valves are not stuck. Replace cover (6) after inspection.
Check the engine oil pressure. Install a pressure gauge in oil line (2) or in port
(1) behind oil supply line (4), see Figure 1. Operate start-up override and start
the engine. If the engine oil pressure is equal to or greater than 175 kPa (25
psi) at low idle and 240 kPa (35 psi) at rated speed, replace-the oil pressure
sensing group (part of the shutoff control group).
actuator valve body to make sure valves are not stuck. Replace cover (6) after
inspection.
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