The pump may be at fault, but let's see if there are other possibilities.
We will assume that the voltage is sufficient. Check to make sure that the shaft on the motor and/or pump are not slipping inside the coupling.
Does the gauge appear to be functioning correctly? Sounds like it is since the facer is turning slowly.
Try checking the pressure with the carriage disconnected, *and the facer turned off. Does the pressure come up? If so, there may be a bypass problem in the carriage hydraulics.
If the pressure still does not come up, remove the pressure relief valve and check for damage. Also, make sure the filter is not clogged, and the inlet is not restricted.
In the event that the adjustment on the pump has been changed at some point, it can be adjusted as follows: With the pump running and nothing moving, (*Facer off,) the pressure should be 900 psi. When the carriage is in motion, *at fusion pressure, say 220psi, the pressure should drop to *approximately 300 - 325 psi or so. When the facer is running, pressure will usually be close to 300 psi. The adjustment nut does not adjust pressure, only the shift point at which the pump shifts from low flow to high flow. The pressure relief valve should be used to set system pressure.
*When you try to adjust the pressure relief valve, with carriage disconnected and facer valve closed, does the pressure respond at all?
Any unusual smells, sounds, or temperatures? (Hydraulic fluid hot, burnt, sludge, etc.? Rattles, knocks, etc.?)
If the rest of the system is sound, and the pump is spinning at the proper speed, the pump is at fault.
Please keep us posted as to your findings.
John
*=Edited part of this post
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