Toyota 7FBEU20:
Hydraulic functions intermittently slow

We run a fleet of twelve 36v Toyota model 7fbeu20 forklifts. I've been having a problem diagnosing an issue we have been dealing with off and on for quite a while now on one of our machines. The hydraulics seem to kick off intermittently. Not 100% entirely off, but an extremely slow creep. When the machine exhibits this problem it is noticeable when you first actuate the lever. In other words, if you pull the lever and it starts moving normally right away, it won't kick out midway through the function. Sometimes it creeps for a few seconds and then kicks in normally, but when it's really misbehaving the hydraulics will just creep the entire time the lever is actuated. This is true with all material handling functions, but steering has never been effected.
Something interesting that I have noticed is that when the hydraulics are creeping along you can quickly tap on the brake and they will kick right in every single time. Same thing if you quickly throw it in neutral, the hydraulics will kick right on.
I'm an in-house guy that does mostly PM work, but we've had our local dealer bring two different techs in to try to diagnose this. Neither one was able to come up with an answer. The material handling AC driver was swapped with a different machine with no change. I swapped the hydraulic pump with another unit thinking it may be an issue with the encoder bearing on the pump motor, no luck there, either. Anyone have any ideas?

Chuck
  • Posted 8 Jul 2016 01:39
  • Discussion started by chuck_w
  • North Dakota, United States
Showing items 1 - 3 of 3 results.
this post is from six years ago. Any chance you figured it out? I am having similar issues. The hydraulic motor just shimmies. Swapped controller from twin lift same results. Swapped the motor from used purchased on ebay, same results. (I used the same encoder as the back of the used motor was damaged in shippping) Any help would be appreciated!
  • Posted 11 May 2022 01:48
  • Reply by Tom_Neron
  • Florida, United States
Tom
I'll recheck tomorrow. Wouldn't it be odd, though, for all three function switches to act up at exactly the same time?
  • Posted 12 Jul 2016 13:06
  • Reply by chuck_w
  • North Dakota, United States
You might want to check the lift switch.
  • Posted 12 Jul 2016 06:36
  • Reply by rogeriwt
  • Massachusetts, United States

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