Regarding the two DH-INVESTIGATIONS Carried out on the returned items from Kinetics and discussions between Jim Garn and Ross Pearson we confirm that both pistons are beyond economical repair as detailed below by our engineering manager.
Numerous attempts at cleaning and re-lapping the working parts have been carried out, but with only limited success.
Both units after initial cleaning will spin for approx. 1minute at 1 bar, but then progressively get worse.
When stripped down, a black dirt line (running circumferentially around the piston at the top end) is evident, that was not there before test started.
We assume this is due to the corrosion at the relieved end of the bore. Dirt is leeching out under pressure from this area.
We therefore advise that two new PCU’s will be required and the end user instructed in the correct operation of the pneumatic units to ensure that contamination does not occur.
2x Model 551 Piston/Cylinder Units
Range: 15..1000 mbar
Standard Factory Calibration
List Price; £2,295.00 - $3757.97 USD each
Less 40.8% Discount
Lead time: 4 to 6 Weeks ARO.
If you decide not to purchase new PCU’s then we will need to charge you $142.46 each to cover the DH-INVESTIGATIONS as described on the attached.
Please relay this information to Kinetics ASAP as they are waiting your formal advice.