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Old 11-12-2010, 10:59 AM   #1
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Location: Riverside, California
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Howard precision steer control

Just bought a Coachmen Catalina (1998) in excellent condition. 47,ooo miles. But I dont know how to operate the system. Anybody who can advixe would be greatly appreciated.........Jack

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Old 11-12-2010, 11:02 AM   #2
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One our members, GaryKD has this system.

I'll let him know about your post.

Adios, Dirk - '84 Real Lite Truck Camper, '86 Wilderness Cimarron TT, previously 4 years as a fulltimer in a '07 DSDP

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Old 11-12-2010, 11:45 AM   #3
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Hi Jon Frosr,
Welcome to iRV2. I have the Howard Precision Steering System (HPSS) on my coach. There should be a small console in the driver's area of the cockpit. The console will have:
1. on/off switch
2. PSI gage
3. Trim button (large yellow button)
4. PSI knob.

1. Before starting the engine turn the system on (with the on/off switch).
2. Start the engine.
3. Does the gage show a build up of PSI?
4. If not, turn the PSI knob clockwise to increase or counter clockwise to decrease the PSI. On normal travel days I run at 120 PSI. On really windy days I up the PSI to whatever allows the HPSS control the coach.
5. Drive the coach. If the coach pulls left or right, get the coach moving in a straight line. Press and hold the Trim Button for a couple of seconds. Release the Trim Button. The coach should continue in a straight line (for the most part).

When environmental situations change you will need to repeat step 5.

I can go for weeks without re-trimming the HPSS. However, there are those days when mother nature has a cross wind with my name on it. On days like that I may re-trim several time throughout the day.

As to maintenance, there is a sight glass for the hydraulic fluid. The fluid level in the sight glass should be about 3/4", from the top of the sight glass. Take this reading with the system turned off.

Because HPSS is out of business, one can use any power steering fluid that meets MIL H 5606 specs. This is basically any modern power steering fluid.

You may need to get a couple of thousand miles under your belt to get comfortable with the feel of the HPSS and trimming process. I leave my HPSS on all the time.
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
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Old 11-13-2010, 08:41 AM   #4
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Location: Riverside, California
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Gary, Thank you very much for the short but complete and understandable instructions. You are a life saver. The information you provided is exactly what I needed to know. We are leaving Riverside, California for my brother's ranch near Roans Prairie,Texas, on Thursday. I have had various travel trailers and motor homes for the past 47 years, but this is the first Class A. So I am a little apprehensive about taking off on a 3,000 plus mile trip. This information helps a lot!.........Thanks, Jack Frost
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Old 11-28-2010, 04:48 PM   #5
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A word of advise:

I also left mine on at all times until I blew out the diaphragm.
I talked to the head mechanic at HPSS just as they were closing the business. (Luckily he could still send me parts.) And they told me to try and keep the PSI around 100.
If it blows the system will be worthless so only use the pressure needed to keep the motor home straight.

Now I always turn mine off unless needed.

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Old 10-28-2013, 06:19 AM   #6
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If you don't like the system, I'd like to buy it from you.

Monaco 2004 Signature 45' Castle IV Detroit 60
Towing 2015 Jeep Grand Cherokee diesel
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