HYDRAMECHANICAL PROTECTIVE SYSTEM
Troubleshooting can be difficult. On the following pages there is a list of possible problems. To
make a repair to a problem, make reference to the cause and correction.
This list of problems, causes, and corrections, will only give an indication of where a possible problem
can be, and what repairs are needed. Normally, more or other repair work is needed beyond the
recommendations in the list.
Remember that a problem is not normally caused only by one part, but by the relation of one part with
other parts. This list can not give all possible problems and corrections. The serviceman must find the
problem and its source, then make the necessary repairs.
Engine Will Not Start.
Engine Will Start, But Shuts Down When Oil
Pressure Override is Released.
Engine Will Only Run Below 70% of Rated Speed.
Air Inlet Shutoff Activates on Load Rejection.
Air Inlet Does Not Close.
Engine Will Not Restart After Operation of
Emergency Manual Shutoff.
Engine Will Not Shutdown When Checking Low
Engine Oil Pressure Protection Circuit.
Shutoff Control Unit Does Not Operate.
FIGURE 1.PROTECTIVE SYSTEM OIL LINES
1. Plug. 2. Oil line to thermostatic pilot valve. 3. Oil
FIGURE 2. PROTECTIVE SYSTEM OIL LINES
return line from diverter valve. 4. Oil supply line to
diverter valve. 5. Oil drain line from diverter valve.
2. Oil line to thermostatic pilot valve. 3. Oil return line
from diverter valve. 4. Oil supply line to diverter valve.
5. Oil drain line from diverter valve. 6. Cover on
actuator valve body.