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856 farmall replaced mcv valve and pump. Everything works. But once up to operating temperature hydraulic warning light comes on. While driving if I press firmly on brakes the light goes out. What is causing this?

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  • Cars & Trucks Master
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Not worked on a tractor before but principle must be the same as car,are the brake components in good condition as a worn brake lining/faulty brake servo could cause the hydralic fluid resevoir to suffer a back pressure that would make sensor light go off so i'd check the brake system and go from there

Posted on May 07, 2014

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SOURCE: THE BRAKE LIGHT WARNING LIGHT COMES ON AND THE

well here's a start towards ur problem, due to the auto circuits u have an open return to the negative side of the battery. Have you done anything with the vehicle's systems before this started? the reason fo the strange lighting is that a positive voltage is being applied to what normally would be return side. You will need to get an electrical diagram if possible to pin point area if as previously asked didn't occur.

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99 caravan 3.3 no abs brakes. I have replaced a bad master cylinder and all 4 rusted brake lines. The ABS brake warning light is not on. The van does not pull to one side.


Something is wrong with your statement
it is a 99 caravan 3.3 no abs , then you are on about abs light pump etc
the abs pump only works when the master cylinder is under pressure and that pressure is suddenly reduced by the sensor reading a locked wheel and a valve is opened to release line pressure to that wheel As soon as that wheel starts to turn, the valve closes
while the wheel is stopped and that valve is open , the abs pump kicks in to maintain line pressure otherwise the brake pedal would go to the floor
master cylinders work through a. abs unit and not because of it so if the master cylinder becomes faulty, the abs pump will not operate until a wheel stops turning as there is no line pressure to stop a wheel turning
the abs light may not be on because there is nothing to operate the system to put it on

Apr 30, 2016 | Cars & Trucks

1 Answer

Having some sort of a fan issue going on...


my guess is you dont know the radiator fan rules.
its different on each of 3 engines
I have the 3.7L in same car, same year, but is WK yours is XK
the larger passenger compartment with bigger engine.
i have the FSM (SM) factory service manual.
so will post the words out of it , its free to read, posted 300+ time here. and no more posts, im going dark....lol
chapter 7 covers both engine.
5.7:
the 5.7 uses hydraulic fan (not electric motors but uses hydraluic motors, off ps pump)
so is the PS, assist ok and no noises from it.?
first the quotes in cht.7
5.7L ENGINE The 5.7L hydraulic cooling fan is integral
to the fan shroud and is located between the radiator
and the engine.
The power steering pump supplies the hydraulic fluid
and pressure to rotate the cooling fan blade, while the
electrical part of the fan is controlled by the FCM.
The hydraulic fan drive (motor) consists of the three
major following components:
² Steering flow control valve
² Fan control valve
² Two stage G-rotor hydraulic drive
The hydraulic fan and drive is not serviceable. Therefore
any failure of the fan blade, hydraulic fan drive or
fan shroud requires replacement of the fan module
because the fan blade and hydraulic fan drive are
matched and balanced as a system and servicing
either separately would disrupt this balance.
end quote now the rules
HYDRAULIC FAN STRATEGY
The hydraulic radiator cooling fan is controlled by the FCM. A PWM (Pulse With Modulated) signal from the JTEC
controls the fan speed. There are four inputs to the FCM that determine what speed percentage of fan is required
by the vehicle. These inputs are:
² Engine Coolant Temperature
² Transmission Oil Temperature
² A/C System Pressure
By monitoring these three parameters, the FCM can determine if cooling airflow is required. If airflow is required, the
FCM will slowly ramp up (speed up) the fan speed until the parameter(s) are under control. Once the temperature
HYDRAULIC FAN FLUID FLOW CIRCUIT
1 - POWER STEERING RESERVOIR
2 - POWER STEERING PUMP
3 - HYDRAULIC FAN DRIVE ASSEMBLY
4 - FAN BLADE
5 - HYDRAULIC FAN CONTROL SOLENOID
6 - POWER STEERING OIL COOLER
7 - STEERING GEAR
WK ENGINE 7 - 35
or pressure is reduced to within operating parameters the fan will ramp up, ramp down, or hold its speed to maintain
the temperature / pressure requirements.
NOTE: Even if the FCM is not requesting fan on operation the fan blade will usually spin between 100 and
500 RPM when the vehicle is at idle. This is due to a controlled minimum oil flow requirement through the
fan drive motor.

so is it still broke, or just a learning curve
its not simple at all.
in fact all 2005 up GC are complex fan controls
every one,
using tables to decide need, and speed.
on all modern jeeps.

Apr 10, 2016 | 2010 Jeep Commander 5.7

3 Answers

Intermittent power steering failure and warning light appears on dashboard. steering is heavy and then is ok


What year , make , model vehicle ? Warning light , electric power steering ? And what would you like to know Allison ? How to fix or what to do ? If your vehicle is a GM product , Chevy , Pontiac , Buick etc... there was a recall on a problem they had . Your best bet is to take it to a dealer .

Dec 01, 2015 | Cars & Trucks

1 Answer

Y dose the john dear 6330 run hot all the time even after it blowen out



Engine or hydraulic system overheating clearpix.gif clearpix.gif clearpix.gif clearpix.gif clearpix.gif clearpix.gif Coolant system low on coolant in 6020, 6030, 6030 Premium, 7020, 7030 and
7030 Premium Series Tractors.

]clearpix.gif//-->
Symptoms
After several hours of work, warning system indicates hot engine coolant or hot hydraulic oil.
Situation or Problem
Coolant level in reservoir is between the "MIN" and "MAX" range but engine or hydraulic system is overheating.
Summary
Air is entering cooling system, hindering coolant flow. Check coolant level. Fill to the "MAX" line on the coolant reservoir.
Bleeding Cooling System:
The bleed valve (see Operator's Manual for location) on the radiator must be closed when the tractor is operating. Open the valve when coolant is drained or filled. If the bleed valve is left open, coolant will internally bypass between the low temperature circuit and engine high temperature circuit causing overheating. When bleeding the system, open the bleed valve and run the engine with no load for 5 minutes at 1700 rpm. Then shut engine off for 5 to 10 minutes before closing the drain valve. Check the coolant level. If level is below the "MAX" fill line, repeat this procedure until coolant level stays at the "MAX" line.

May 21, 2014 | Cars & Trucks

2 Answers

Brake light stays on in dash 96 ford thunderbird


Hi, there are 3 things that can cause the light to stay on.
One is the parking brake switch, which may have shorted internally or to chassis ground. The switch is above the parking brake pedal. If the connector is still on the switch remove it. If the light goes out, replace the switch.

The second is the fluid level in the master cylinder reservoir. Check fluid level. If good, check the sensor by taking the cable off. If that puts the light out, replace the sensor.

The third is the pressure differential warning switch. The switch turns on when there is a brake failure. You would probably know if this happened. If not, check all wheels for brake fluid leaks. If you have a leak and need help with repair procedures, please get back to me. If you have completed repairs, please read the procedures below from autozone.com to reset the warning switch.

Please let me know if you have any questions and thanks for using FixYa.


From autozone.com:
A pressure differential warning valve is incorporated in the hydraulic system. The signal from this valve consists of a warning light on the dashboard activated by a differential pressure switch located below the master cylinder. The signal indicates a hydraulic pressure differential between the front and rear brakes of 80-150 psi, and should warn the driver that a hydraulic failure has occurred.
After repairing and bleeding any part of the hydraulic system the warning light may remain on due to the pressure differential valve remaining in the off-center position. To centralize the valve a pressure difference must be created in the opposite branch of the hydraulic system that was repaired or bled last.
Front wheel balancing of cars equipped with disc brakes may also cause a pressure differential in the front branch of the system.


VALVE CENTERING PROCEDURE

  1. Turn the ignition to either the ACC or ON position.
  2. Check the fluid level in the master cylinder reservoirs. Fill to within 1 / 4 in. (6mm) of the top if necessary.
  3. Depress the brake pedal firmly. The valve will centralize itself causing the brake warning light to go out.
  4. Turn the ignition off.
  5. Prior to driving the vehicle, check the operation of the brakes and obtain a firm pedal.

Dec 24, 2010 | Ford Thunderbird Cars & Trucks

2 Answers

I just did a few repairs all at once. I replaced the oil pan gasket, oil filter and oil. I replaced the transmission fluid filter, transmission pan gasket and transmission fluid. I put in new spark...


I would guess one of the valves are sticking or the lifters, but to me it sounds like the oil pump is either clogged or not working. Which would explain the engine light and the tapping sound. I hope this helps Tim

Aug 26, 2010 | 1994 Jeep Grand Cherokee

3 Answers

Coolant Warning Light


Some models have a bleeder valve located on or near the thermostat. Not all manuals will show this vital component. If yours has one( if your coolant recovery bottle is above highest point of radiator you do) you need to bleed the air out of your cooling system. Do this by opening the valve until coolant comes out. Do this a couple of times as your car is getting to operating temp. should solve your problem.

Aug 20, 2008 | 1992 Cadillac DeVille

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