Hyster S60XM:
Hydraulic pressure

I am working on a S60XM that is only developing peak 1500psi then drops to 1100psi at the test port at the control valve. I have tried adjusting the inlet and the outlet pressure relief valves. With no change in pressure. I took the control & presssure valves apart, cleaned them up and replaced the seals. No change but the pressure will adjust from 0psi to 1500psi peak out then it is still dropping to 1100psi. The motor acts like it is still under a heavy load after the hydraulics are run to bypass. I am afraid that the pump is the culprit but am trying to avoid this expensive repair. Any Ideas the group may have would be very helpful.
  • Posted 1 May 2009 06:56
  • Discussion started by HOTROD
  • Colorado, United States
RODNEY BAKER
BLUE MOON LIFT SERVICE
Showing items 1 - 9 of 9 results.
dia duit
sorry i forgot to say after stripping orbital unit found outside spool small holes at bottom blocked with debris from spring a full dismantling job required
good luck
and remember old mechanics never die just stop to recharge there batteries
  • Posted 9 Jul 2020 06:48
  • Reply by McEvoy_Stephen
  • Northern Ireland, United Kingdom
stephen
Dia duit
just had same probelm put a test guage on main hydraulic pump 7/16 unf you should only have about 400psi 20 bar stand by pressure I found my probelm was a broken spring in the small brass check valve on the feed pipe into steering orbital unit and unfortunately it got inside orbital steering unit and partially blocked return to tank which caused hydraulics to overheat after taking over for half hour or so or sooner if driven I hope this helps someone cause it took a long time to find slan go foil from ireland
  • Posted 9 Jul 2020 06:45
  • Reply by McEvoy_Stephen
  • Northern Ireland, United Kingdom
stephen
priority valve could be stuck open but going by the hours i would reckon the pump needs replaced
  • Posted 6 May 2009 02:30
  • Reply by kevin_k
  • dumfriesshire, United Kingdom
Oh yeah this unit is a 96 with a GM 3.0 and has about 9000 hours on it. I suppose I just need to bite the bullet, pull the pump and tear it apart to see what gives. I just was hopeing for a quicker and cheaper (for the customer) repair. Any Info on the priority valve would be great. Hopefully thats all it is, I can replace the priority valve o-rings and get them back up and running.
  • Posted 5 May 2009 05:37
  • Reply by HOTROD
  • Colorado, United States
RODNEY BAKER
BLUE MOON LIFT SERVICE
How would the steering priority valve cause the pump to loose suction. I am asking because I haven't as of yet had to repair one and if I tear into it I would like to know what to look for. The Suction hose is not colapsing and there is no air in the hydrailic fluid. The unit has about 1500 max PSI. But what gets me is that this unit was just fine 2 weeks ago when I did a PM on it and had to move some heavy pallets with it to make room to work. Now it hasn't enough to lift much of anything like something is bypassing the control valve. I thought the steering priority valve just kept fluid moving to the steer orbital
  • Posted 5 May 2009 05:28
  • Reply by HOTROD
  • Colorado, United States
RODNEY BAKER
BLUE MOON LIFT SERVICE
what age of truck?? how many hours??have you checked the steering priority valve ??
  • Posted 2 May 2009 21:04
  • Reply by kevin_k
  • dumfriesshire, United Kingdom
definitely check the above remarks, my money is on the hyd suction filter plugged or the pump itself is faulty
  • Posted 1 May 2009 23:10
  • Reply by Prentice
  • Ontario, Canada
take a good close look at the suction hose and make sure it is not collapsing too.
  • Posted 1 May 2009 20:02
  • Reply by edward_t
  • South Carolina, United States
when you remove the hyd tank cover (with the hyd running) do you hear bubbles?
  • Posted 1 May 2009 13:43
  • Reply by Jan_Haayer
  • Nova Scotia, Canada

Having trouble using the Discussion Forums? Contact us for help.

Forkliftaction.com accepts no responsibility for forum content and requires forum participants to adhere to the rules. Click here for more information.

Sydney, NSW, Australia Building on its initial deployment of four Dematic automated guided vehicles (AGVs), Lactalis Australia, part of global dairy producer Lactalis, has invested in an additional...
Lakeland, FL, United States Automotive supplies wholesaler Integrated Supply Network has been expanding its distribution centres, dealing with staffing challenges and responding to an increase in small package shipments...

In the Virtual Expo

Roypow LiFePO4 batteries
Our LiFePO4 batteries for forklifts can save up to 70% of your battery costs and come with a five year warranty. Simplify your forklift fleet with RoyPow.

In the Discussion Forums

Next Editorial Features

1. FORKLIFT INNOVATIONS – Nov 2021
2. REDUCING ENVIRONMENTAL IMPACT – Feb/Mar 2022

In the Discussion Forums

Melbourne, Vic, Australia Worksafe has confirmed that a 25-year-old stonemason died after an incident involving a forklift at a Somerton factory in Melbourne's north. It is understood the...
Balkancar adds electrical platform trucks - Sofia, Bulgaria New order picker from Linde - Aschaffenburg, Germany Mitsubishi adds heavy-duty electric - Walsall, United Kingdom

In the Virtual Expo

The Combi-XC from Combilift
The Combi-XC: This medium sized straddle carrier can travel at 24km/h for the speedy movement of containers over long distances.

Next Editorial Features

1. FORKLIFT INNOVATIONS – Nov 2021
2. REDUCING ENVIRONMENTAL IMPACT – Feb/Mar 2022
Bergheim, Austria Faced with competition from electric competitors, Palfinger has developed a Silent Pack for its F3 151 truck-mounted forklifts (TMF). The company boasts that its versatile...
Northumberland, United Kingdom B&B Attachments has developed a bespoke clamp forklift attachment to handle a wide range of concrete pipes and manhole chamber ring diameters and lengths safely...

In the Virtual Expo

BEAST Smart Forklift Scales
The BEAST Smart Forklift Scales. Featuring sturdy all metal construction, quickest reload time, wireless connectivity, integrated printer, and cumulative weight count.

In the Discussion Forums

Next Editorial Features

1. FORKLIFT INNOVATIONS – Nov 2021
2. REDUCING ENVIRONMENTAL IMPACT – Feb/Mar 2022