Lack of power on Cases IH 5140

Hello

We have a case IH 5140 (4X4). We recently replaced the hydraulic pump on it. For some reason, the tractor is not getting enough power to pull, or to plow. On reverse speed, all is going well. when going forward the tractor does not get enough traction and power to pull (we are talking about small load that normally the tractor handle without issue- 3 bottom disk plow). The tractor speeds shift OK.
does anyone know what may be the issue?

I sincerely appreciate any help.

Tembo

So, Did it have power before you replaced the pump? How do/did you test in reverse? It could be a sensing problem that is keeping the pump full stroked when you put it in forward. Didn't swap a hydraulic hose somewhere in the change out did you.
The engine is not starving for fuel by any chance. Don't know your lift pump but some have a pesky little filter in the pump unseen and unknown unless you destroy the pump. About the size of the end of you little finger from the last knuckle up.

hth Tom

i'd bet it's an electrical problem somewhere...
if everything is ok in reverse, but struggles
to move in forwards then i'd start y checking
the solenoid , and/or relays that control the
forward/reverse... you could start by just
swapping them around, so the forward relay and
solenoid into the reverse positions and vice
versa. If the problem remains in forward only
then i would suspect a bad wire someplace, if
the problem moves to reverse the change either
the relay or the solenoid...

First off they switched out a hyd pump. Best to determine if the pump is functioning properly, before pulling wires and reinstalling them improperly. The pump was expensive enough, and your test procedure could wipe out the powershift tranny, to boot.
Lopren, the Acg.

What happens: does the engine bog down, does the transmission slips or do the wheels spin?

Lopren, don't mean to argue, but if his tractor is fine in reverse then the pump/powershift is working fine... believe me i have been into the insides of these tractors more than i care to mention, my 5140 has been completely stripped down as far as the powershift tranny and hydraulic system goes due to a fault that our Case dealer couldn't trace, but the tractor wouldn't move under load and has no steering when another hydraulic function was being used... (the pump/compensator where fine - i know cause i paid for new ones Case dealer said they failed the tests in their manual - which they did... but not because they were faulty... and the fault still remained).

I fail to see how swapping two solenoids and relays around could possibly harm the transmission. All the relays do is provide power to the solenoids, which provide oil to the clutch packs...

Can't help you. Was afraid of this kind of thing ,
so I traded my 5140 off before it started to have
kittens.

Tom,
Thank you for your time.
we changed the hydraulic pump because the tractor was not moving at all, not even the steering system. after replacing the pump, it started moving and the steering system working. the Idea of switching solenoids makes lot of sense.
Thanks

I am not quite sure about the transmission slipping but the wheels rotate properly.

does the steering work properly, especially when
using the hydraulics for something else?? And is
the light on the dash board flashing at you??
yellow light lower left side above the headlight
switch, if it is flashing, count the number of
flashes.

We will check on those lights for signs of flashing on dashboard
Thanks

Does this tractor have any hyd test ports so a gauge can be installed to monitor pressure's?

Does the tractor have a neutral position on the
forward/reverse lever by the steering wheel?
There is the of chance that there is a sticking
valve in the system, but usually when the
valve sticks (it will stick open) that there is
no drive and the steering doesn't work unless
the tractor is reving higher than idle...

Take the seat out of the cab (4 bolts under the
mat - and the electrical connection for the
operator presence switch/ air compressor), and
on the top of the transmission housing is a
valve block, has clutch and pto cable going to
it and some solenoids (about 12inches sq/30cm
sq) take the block off and check the valves
inside, one of them may be stuck...

This stuck valve causes all sorts of issues, as
hydraulic oil is dumped back into the
transmission housing, it steals oil from
everything else it seems... took me 3 months to
find this issue after the CaseIH dealer wanted
a new pump/compensator (major $$$$) - which we
did and no change) so i took the tractor home
and slowly went through the entire hydraulic
system...

We had a 5230 back in the day. One day while cutting hay it started slowing down while cutting hay. It went to the dealer on a truck. Turned out a teflon seal on the trans main shaft went bad allowing two clutch packs to be locked at the same time. After a powershift rebuild it was back home cutting hay until the next problem popped up and it seemed there were plenty. You don't want to hang parts on these tractors because they are very spendy. Take it to someone with the experience, manuals and special tools to diagnose and repair them. Just like Bruce from Can. we sent the 5230 on down the road because its future looked expensive. A decent tractor but not a good tractor.

Some good stuff I have forgotten mentioned here. I included a link to the parts page to the valve also. Before you go any further put the trans in at least 3rd and assuming it is powershift see if you can kill the engine with the brakes, try each of the four PS speeds, reverse also. Really would rather you did it in fourth if it will pull itself, you won't be able to do reverse in 4. If it can be killed with brakes you have some issues somewhere else. There are numerous plugs on the power shift manifold if it is such. And two plugs on the top of the shuttle valve. You need some number 4 ORB male fittings to tap into either valve and a couple hoses and 600 psi gauges. Get back to us before I confuse you any further. Tom

http://partstore.caseih.com/us/WilliamsTractor/parts-search.html#epc::mr57386ar1044991

Thanks for all your tips. They have been helpful . just and update.
The machine is going forward but with such heaviness, not able to get full strength.
On reverse or going backward, the machine is moving excellently.

Since it is the same mechanism involved in reverse and forward, I checked the pressure switch forward:
1- Machine running ie the engine running, clutch disengaged (maintained support) and direction selector walk in the ON-forward position.
- The pressure switch unplugged, a multi-meter checked for continuity:
Result: There is continuity. That makes us believe the pressure switch to forward gear is in good condition

The harness side from computer: the two conductors gives me a continuity to ground while I expected only one wire was supposed to..
I did the same for the pressure switch at reversing it. It worked as I thought.

And I tried to exchange, intervert, switch the circuit of these pressure switches: pressure switch forward connected to reverse and vice versa. The machine does not move, neither forward nor backward.

Therefore, I concluded the fault is on the electrical or electronic circuit or directly into the computer itself.

any other thoughts