Well I'm now at about 2,800 miles on my M37 since I brought it back from the graveyard, and just installed my 4th, yes 4th Power Steering Box. And yes I'm sure it's partially do to how I use (abuse) the M and the over-sized Super Swamper Tires.
The 1st Box went into service in 2007
The 2nd Box went into service November 2010
The 3rd Box went into service in June 2012
This Box is going into service in June 2015
So it looks like I get about 3 years of service out of a box.
I encountered a new twist with the installation of this rebuilt box. The hose/line connection ports apparently had bad flare line mating surfaces and the re-builder installed some repair fittings that seal against the box and provide a clean new flare flange for the line to seal against. I tried to use the box with out the one on the High Pressure side, but the hose/line would not tighten/seal. The problem is it moves the lines further inboard, closer to the frame.
The High Pressure line now hit the added flange that I welded to the frame to attach the Power Steering Box Bracket. I had built the flange a little larger than needed but had not had any issue with previous steering boxes. So in order to allow the box to work I had to cut a slot into the flange. Out came the drill and the air saw and dremel tool. Not a lot of clearance for the line but I did not want to cut too much of the flange away, but the material removed should not affect it's strength.
The 1st Box went into service in 2007
The 2nd Box went into service November 2010
The 3rd Box went into service in June 2012
This Box is going into service in June 2015
So it looks like I get about 3 years of service out of a box.
I encountered a new twist with the installation of this rebuilt box. The hose/line connection ports apparently had bad flare line mating surfaces and the re-builder installed some repair fittings that seal against the box and provide a clean new flare flange for the line to seal against. I tried to use the box with out the one on the High Pressure side, but the hose/line would not tighten/seal. The problem is it moves the lines further inboard, closer to the frame.
The High Pressure line now hit the added flange that I welded to the frame to attach the Power Steering Box Bracket. I had built the flange a little larger than needed but had not had any issue with previous steering boxes. So in order to allow the box to work I had to cut a slot into the flange. Out came the drill and the air saw and dremel tool. Not a lot of clearance for the line but I did not want to cut too much of the flange away, but the material removed should not affect it's strength.
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