Discussion:
Hyster s150 power steer fault

Hi guys
I have a Hyster S150A year build 1984 with power steer fault as will not turn when truck is stationery but does work when jacked up or truck is moving but not great, gets to quater of a turn then belt slips ordered new belt from Hyster but was still the same bought next size down but still the same I have taken a pressure reading from the valve bolted to the left hand side of the chassis under the floor plate, the reading went up to 1000psi the belt started slipping again can not get a pump (vickers H266)from TVH Hyster will be too expensive has anyone experienced this before or know if the pressure sounds right.
Many thanks Ade
  • Posted 9 Apr 2015 04:43
  • Discussion started by Forkade
  • Berkshire, United Kingdom
Showing items 1 - 4 of 4 results.
Does anybody have a manufacturers part number for the genuine belt. Ive had them before and i think they are steel impregnated. Id like to order a new one but have lost the part number. Thanks
  • Posted 13 Feb 2021 06:01
  • Reply by andrew_k
  • England, United Kingdom
Hi Keith
Have just returned from fitted a new clogged belt, and would you know it it's working fine, and the lesson for the day is never take anything for granted even if the manufactor sourced and supplied it,anyway many thanks for your help, very much appreciated.Ade
  • Posted 22 Apr 2015 04:13
  • Reply by Forkade
  • Berkshire, United Kingdom
Good afternoon, We have had considerable experience with these trucks and the symptoms you are describing. The S150A were notorious for poor break-away [from a standing start] steering. We have found the following things will improve the steering.

1 replace the belt with an OEM Hyster belt [no aftermarket belt works as well. In fact we stock one at all times!]
2 Replace the pulley with an OEM pulley, if even slightly worn.
3 Increase relief pressure on the power steering pump from 1200psi to 1800psi. Relief valve is in the side of the rear cover of the pump. Remove the roll pin and plug to access the relief valve, remove one of the thinnest shims, re-install and test with gauge. Repeat process until you get desired pressure.
4 Finally, if all else fails, replace the steering tires [tyres] with the hardest compound tire [tyre] you can get. There is a lot of weight on the back axle and softer tires will "flat spot" and grab and smooth surfaces.

We have seen dozens of these over the years as we work on the components off them [Pumps, orbitrols, valves, axles, etc.]. When we get a call regarding poor steering, the first thing we do is send the customer a new OEM belt. It solves the problem 50% of the time. From there, you may have to get aggressive.

Hope this helps. Regards, Keith Williams - Aztec Hydraulics Inc.
  • Posted 9 Apr 2015 22:40
  • Reply by Keefer
  • New York, United States
what type of belt are you putting on it? a cogged belt? those work best.
also check the V in the pulleys and make sure they are not worn out, if they are you will need to replace the pulley's because if they are worn out no belt new or not will work.

As for the pressure i'm not too sure on that, 1000psi seems a bit low, i was thinking it should be around 1250. There should be a relief pressure valve on that pump or on the steering orbital valve.
  • Posted 9 Apr 2015 10:24
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
swoop223@gmail.com

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