Mine does that too. not to stated that our noise is one in the same, but I have located my high pitch noise coming from the controls (not the actual radiating heated part). I can quickly get rid of the sound by flipping the control setting from high to medium, then back to high. I too am concerned that there might be something inherently wrong with the heater, and that it might not last, or worse, catch fire later on. I will be returning and getting a replacement for it today. Got 2 of these heaters from Wally World, one is noisy and one is not.
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Unplug the machine from the electrical, then remove the unit from the basket and make sure the blades are clear of scrap paper.
Replace the unit and make sure it is facing in the correct direction and squirt, or lightly pour mineral oil (or machine oil, or something like WD-40) directly on the rollers and let it absorb into the remaining paper for a few minutes then try running the unit.
If that solves your problem, you should squirt a little lubricant onto the blades for every one hour of use.
Unplug the unit from electrical. Remove any scraps of paper from the bottom of the blades.
Replace the unit on the basket (make sure it is facing in the correct direction) and squirt, or lightly pour mineral oil (or machine oil, or something like WD-40) directly on the rollers and let it absorb into the remaining paper for a few minutes then replug it in the electrical and try running the unit.
If that solves the problem, squirt a small amount of lubricant on the cutting blades for every one hour they are in use.
I suspect that the oil pump is not producing sufficient pressure to do the job. have a pressure test done to check this. It is possible when reassembling the unit that there is a leak in the system (missing-damaged seals ,gaskets ) that is allowing oil to squirt of a join (loose bolts). Recheck the band and clutch pack adjustment now that it has been run.
If I checked out the right video it sounds like a fan motor. After a fan motor heats up and with age the fan will leak a little oil, the oil will become to thin and not cote the bearings well enough. It sounds like the fan trying to start back up after stoping. I would track down the fan motor and replace it.
If the vehicle has had proper oil changes,the noisy valve lifters may the oil filter.If the anti-drainback valve is defective and the filter is at an angle,it may take a few extra seconds to refill before can supply the engine with normal oil pressure.
Also,at the last oil change,has the proper oil viscosity been used?
The noise at the dash is usually a hose.Have someone move the hoses a little while you sit inside and listen for changes in that noise at 2000 to 3000 rpm.As it becomes quiet,adjust the hose or whatever that new position.
Sometimes on the fan motor the bearings have to be lubricated. You have to remove the cover on the air conditioner with the unit unplugged and squirt a drop of 3 and 1 oil where the shaft and motor meet.
clean the pollen filter ,as for engine then change the oil for a detergent oil and also put a couple of squirts of washing up liquid in with the oil as well and run it around for a week then the hydraulic tappet noise should stop then make sure you change the oil every 6000miles with a oil filter every third oil change ,your oil has beeen left too long and its gummed up the hydraulic tappets
You dont state the engine size. A ny oil leak whether dripping on the floor or remaining on the engine should be investigated as there should NOT BE ANY WET OIL LEAK. Grime is another story and should be cleaned appropriately. The "popping " noise you're hearing turning slowly sounds likw a bad CV ( constant velocity ) joint on the front axle. There are 2 cv joints on each front axle. Possilble leaking boot throwing grease near the back of the front wheel to indicate which joint is noisy. Check the B/U light fuse. Hope this helps.
The oil pressure dropping to zero is common for cherokees. Replace the oil pressure sending unit and it will be good as new. Cracked exhaust manifolds are also common. Usually it will crack where the 2 pipes are welded into 1 pipe before it connects to the front pipe. There are lots of replacement headers out there to choose from. I just ordered one through quadratec.