Re: ford 600

Posted by txblu on April 12, 2004 at 12:37:13 from (199.46.199.231):

In Reply to: ford 600 posted by ken eakin on April 12, 2004 at 10:38:55:

The position control positions a spool that delivers or removes fluid from the lift piston. Once repositioned, the lift piston's response moves a leveraging system that centers the spool when the new position is reached. This deactivates the lift mechanism. Any movement in the system upsets this balance and the direction of the unbalance determines the direction of reaction. Hence any time the lift arm is below the set point, fluid is sent to the lift piston. If the lift piston cannot hold pressure (2500 psig) it will leak and allow the arms and load to fall thus causing the cycle to repeat.

Best test is remove the plate where your fluid level detector is (dip stick) and using a mirror and flashlight, look up from inside under the seat and you will see the lift assy. If you see fluid coming out at anything more than a drip, your lift piston Oring is worn out and requires replacing.

Not a big job but cubmersome. Parts are readily available (Oring and backup washer, housing gaskes and 2 O rings for the hydraulic fluid in/out to the lift cover). While at your NH dealer get an I&T Manual for your unit which tells you how to do it and what to adjust. You don't need their special tools if you understand where they want things positioned when adjustments are made. If your only problem is hiccups, you probably can dispense with any adjustments and just remove and replace the seals. While your piston is out you might check your cylinder for EXCESSIVE scoring. The easiest way to get the cylinder out is no more than 30 psig compressed air directed in to the assembly from the back (like where the fluid would be coming in and going out of the cylinder). The piston will pop out. Follow directions on seals as if you get the leather type it has to be soaked to slide over the piston (remember cowboy movies, soak rawhide ropes and get yourself untied). Get a helper as it takes 2 sets of hands.

txblu

Follow Ups:

• Re: Re: ford 600 ken eakin 13:40:29 04/12/04 (1)
  • Re: Re: Re: ford 600 txblu 05:28:02 04/13/04 (0)

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