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sound like you have lost presure switch that is supposed to relive presure when presure is high or the belt is too tight putting presure on the bearing causing over heat or oil cooler restricted and not coolling the oil
hydraulic pump may be going out, you have to have a good working pump for your hydraulics to work right, there are also some check valves that could be leaking, this will also give you a low pressure reading, low pressure will also effect pto engagement
check foe fuel pump presure at fuel rail,,,if u have fuel pump presure check all fuses with a test light not buy sight,,could be deceviving ,look at and check to see if fuel pump relay is working if no fuel presure i,if u have presure in fuel rail ,replace the cranck shaft sensor
hi how are you?just because you hear the fuel pump running does not mean that it is pumping enough preasuer to the motor to open the injectors. you need 48 lbs with key on engine off and with the vacume line off the presure regulator.if you have enough presure then you will have to check for a good blue spark.the fuel presure test port is located just under the thermostat housing on the steel fuel rail.
if this occurs when the unit is in use for only hot water, there will be an internal leak in the secobndary heat exchanger, you will have to replace it. check first that the charging link has been removed when testing to ensure it is not passing.
if it happens when the heating is switched on then check the presure in the expansion vessel ( dump all presure from system and use a car foot pump with a gauge there should be 1 bar presure) that is the big red thing behind the pump, if water comes out of the test valve on the front of it when you try to test it or it wont hold the presure you will have to replace it (a nasty job you have to strip half the boiler) if you can pump it up make sure you release the presure in the system as you pump it or you will get a false reading