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DISCUSSION FORUMS : Forkliftaction.communicate
Forum: Lifting machines
Discussion:  Hyster H50H
Number of messages: 7

START MESSAGE:
bbforks
Pennsylvania, United States
Is there anyone out there familiar with this older lift. Serial # is D3D8910. This is a new account for me & I'm unfamiliar with how the hydraulics are set up. It has a manual trans with P/S. I believe it has a wet bell housing also.

Situation is that all hydraulic functions stopped working all of a sudden & the hydraulic tank overfilled. P/S doesn't work at all, hoist & tilt will operate very slowly ( & act like there's air in the system) at full governed RPM.

Any input or a hydraulic schematic would be greatly appreciated. Thanks

-------------------------
bbforks (at) Hotmail (dot) com
Customers love technology- until they have to pay to fix it!


Posted 11 Jul 2017 03:50 AM Reply  Report this message
REPLIES: Sort replies by
duodeluxe


Sounds like it is *** air. Is the hydraulic oil foamy?
The first and cheapest thing to try is replacing the suction house. I've seen where they get porous enough to *** in air but not enough to leak.

-------------------------
duodeluxe

Posted 12 Jul 2017 08:59 PM Reply  Report this message
bbforks
Pennsylvania, United States
Tx for the input- I did think of that but the oil is not foamy & I had it running for about 1/2 hour & it never overflowed for me.

I'm thinking that either the flow divider or the pressure regulator to the P/S & trans circuit failed, I just don't have a parts or service manual to confirm what I find if I disassemble those 2 units.

-------------------------
bbforks (at) Hotmail (dot) com
Customers love technology- until they have to pay to fix it!


Modified 13 Jul 2017 01:45 AM
by poster.
Reply  Report this message
timothy_b
Hampshire, United Kingdom
Digging into memory.............Bellhousing is wet but there is a scavenge system . Check the oil scavenging in the bell housing.
There is a cast aluminium scavenge  scoop in the bell housing. If it has become loose, broken or worn away by the scavenge ring (like a round cake tin) after it came loose, the bell housing will fill up.

Tim B
Hampshire , England.
PS if you ever need to separate the engine from the transmission you will need to loosen the scoop fastening capscrews so that it can be "extracted" from the scavenge ring.



-------------------------
unofficial info. man !

Modified 13 Jul 2017 02:35 AM
by poster.
Reply  Report this message
towmotor
Ontario, Canada
you can get at the scavange tube from under the plate on top of the bellhousing ,you can adjust it by moving it side to side .

Posted 16 Jul 2017 03:17 AM Reply  Report this message
bbforks
Pennsylvania, United States
Would the wet bellhousing scavenging system cause a loss of hydraulics in both the  hoist/tilt & P/S systems?

-------------------------
bbforks (at) Hotmail (dot) com
Customers love technology- until they have to pay to fix it!


Posted 18 Jul 2017 09:52 AM Reply  Report this message
towmotor
Ontario, Canada
Nope ,sound like a problem with the pump, is has a priority valve in it.steering gets the oil first no hydraulicsi would say pump.

Posted 18 Jul 2017 09:16 PM Reply  Report this message


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