Question about John Deere 300 / 316 Hydrostatic Tractors Part Manual

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Oil foams in hydro pump and no power steering and no hydrualics work

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What happens when they add air to the milk in your latte at Starbucks? It foams. When you aerate the water coming out of your faucet? Lots of bubbles. When you as a kid would blow through a straw into your milkshake and make even more bubbles? Air. Your hydraulic system which is almost always without a doubt under very high pressure, has developed a leak and is sucking air into the system. Get it pressure tested and repaired before you damage your hydro system running air inside instead of hydraulic fluid for lubrication.

Posted on Mar 02, 2015

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Posted on Jan 02, 2017

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Rtz42 steering issues


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How to fix AUDI steering oil owerflows from reservoir


Check up the hydraulic power steering pump.
See picture below for 1.6, 1.8 liters Audi (4 cyl.) engines:

If you find leaks and noise when runing, the hydraulic vane type pump is damaged. The pump inputs air inside and mix air with oil resulting foam. Therefore fluid volume inside steering instalation rises. Then pressure overflows oil from the reservoir. You need repair or replace hydraulic vane type steering pump.

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Can someone tell me if the hydro boost could


Depends on the car and the problem.
The hydro-boost gets pressure from the power steering pump on some models, so the pump could affect the hydro-boost but usually not the other way around. You could disconnect the hydro-boost lines and the power steering should still work.

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2001 chevy tahoe vacum hoeses for power steering


Hello! There are power steering fluid in/out hoses but no vacuum lines...It sounds as if the pump needs to be bled of air or the belt is loose...Belt should move about 1/2 to 3/4"...Bleeding is as follows...
Guru...saailer

    ImportantPower steering fluid level must be maintained throughout bleed procedure.
  1. Fill pump reservoir with fluid to minimum system level, FULL COLD level, or middle of hash mark on cap stick fluid level indicator.
  2. ImportantWith hydro-boost only, the oil level will appear falsely high if the hydro-boost accumulator is not fully charged. Do not apply the brake pedal with the engine OFF. This will discharge the hydro-boost accumulator.
  3. If equipped with hydro-boost, fully charge the hydro-boost accumulator using the following procedure:
  4. 2.1. Start the engine.2.2. Firmly apply the brake pedal 10-15 times.2.3. Turn the engine OFF.
  5. Raise the vehicle until the front wheels are off the ground. Refer to Lifting and Jacking the Vehicle in General Information.
  6. Key on engine OFF, turn the steering wheel from stop to stop 12 times.
  7. Vehicles equipped with hydro-boost systems or longer length power steering hoses may require turns up to 15 to 20 stop to stops.
  8. Verify power steering fluid level per operating specification. Refer to Checking and Adding Power Steering Fluid .
  9. Start the engine. Rotate steering wheel from left to right. Check for sign of cavitation or fluid aeration (pump noise/whining).
  10. Verify the fluid level. Repeat the bleed procedure if necessary.

May 03, 2012 | 2001 Chevrolet Tahoe

1 Answer

How do I know if my Power steering unit(?) has to be replaced


no power steering fluid would cause the pump to overheat, damaging seals.
the foam might have been pump cavitation causing injestion of air in the fluid, (makes the hydro fluid "frothy")
spraying ANY lubricant on the belts will cause them to slip and make a squeaking/squealing noise.

check the location of the leak, wipe down the hoses (cheap causes for leaks) fill the power steering. put some newspapers under the car, start the car, turn the wheels lock to lock, shut off car, check for leaks, should tell you if it is a hose or connection, or rack unit

Apr 16, 2012 | Mazda 626 Cars & Trucks

1 Answer

My brakes and power-steering are not working. The brake pedal is hard, but the brakes will not engage. The power steering was not working at the same time. It has brake fluid, but when I took the power...


Yes, your brakes are boosted by the power steering pump rather than by vacuum. I don't think it's air in the system. More likely your pump has failed, but you can try bleeding the pump. Here is a procedure from autozone.com:

Observe the following:
Use clean, new power steering fluid type only Hoses touching the frame, body or engine may cause system noise. Verify that the hoses do not touch any other part of the vehicle. Loose connections may not leak, but could allow air into the steering system. Verify that all hose connections are tight.


NOTE Power steering fluid level must be maintained throughout bleed procedure.

  1. Fill pump reservoir with fluid to minimum system level, FULL COLD level, or middle of hash mark on cap stick fluid level indicator.
    NOTE With hydro-boost only, the oil level will appear falsely high if the hydro-boost accumulator is not fully charged. Do not apply the brake pedal with the engine OFF . This will discharge the hydro-boost accumulator.
  2. If equipped with hydro-boost, fully charge the hydro-boost accumulator using the following procedure:
    1. Start the engine.
    2. Firmly apply the brake pedal 10-15 times.
    3. Turn the engine OFF

  3. Raise the vehicle until the front wheels are off the ground.
  4. With key in the ON position and the engine OFF , turn the steering wheel from stop to stop 12 times. Vehicles equipped with hydro-boost systems or longer length power steering hoses may require turns up to 15 to 20 stop to stops.
  5. Verify power steering fluid level per operating specification.
  6. Start the engine. Rotate steering wheel from left to right. Check for sign of cavitation or fluid aeration (pump noise/whining).
  7. Verify the fluid level. Repeat the bleed procedure if necessary.

Observe the following:



Use clean, new power steering fluid type only Hoses touching the frame, body or engine may cause system noise. Verify that the hoses do not touch any other part of the vehicle. Loose connections may not leak, but could allow air into the steering system. Verify that all hose connections are tight.
NOTE Power steering fluid level must be maintained throughout bleed procedure.
  1. Fill pump reservoir with fluid to minimum system level, FULL COLD level, or middle of hash mark on cap stick fluid level indicator.
    NOTE With hydro-boost only, the oil level will appear falsely high if the hydro-boost accumulator is not fully charged. Do not apply the brake pedal with the engine OFF . This will discharge the hydro-boost accumulator.
  2. If equipped with hydro-boost, fully charge the hydro-boost accumulator using the following procedure:
    1. Start the engine.
    2. Firmly apply the brake pedal 10-15 times.
    3. Turn the engine OFF

  3. Raise the vehicle until the front wheels are off the ground.
  4. With key in the ON position and the engine OFF , turn the steering wheel from stop to stop 12 times. Vehicles equipped with hydro-boost systems or longer length power steering hoses may require turns up to 15 to 20 stop to stops.
  5. Verify power steering fluid level per operating specification.
  6. Start the engine. Rotate steering wheel from left to right. Check for sign of cavitation or fluid aeration (pump noise/whining).
  7. Verify the fluid level. Repeat the bleed procedure if necessary.

Oct 24, 2010 | 2005 Chevrolet Silverado

1 Answer

Have 2 Hummers ( both 1995) that have a Hydrualic 'boost' loss to steering when brakes applied. Steering power increases if I flip the throttle which allows me to turn the wheel when throttle is hit....


at the back of the pump where the high pressure line attaches. I'm not saying thats your problem, but thats where the valve is. I think if you disconnect it, it should have full boost.

Aug 31, 2010 | Hummer H1 Cars & Trucks

1 Answer

Power steering is stiff, if fluid is low can that cause the problem? which holding tank is for power steering fluid.


The tank has a green reservoir cap usually. The cap will also tell you if you are to use hydrualic oil to refill. The brand name is Peltosin and is sold at CarQuest etc. It is expensive, about $15-$20 per liter. You do NOT want to mix power steering fluid (ATF fluid) with hydrualic fluid. Make sure you know what your car requires and make the adjustment to the level as you need. Don't over fill, and keep the fluid from spilling on any painted surfaces etc. Wash with soap and water immediately if you happen to spill. The low level can be the cause of the hard steering, but also make sure the belt is tight and in good condition. It is a good idea to check tire air pressures too. Keep them above 30psi om 14" wheels, and higher as the wheel size increases. If you have 15" or 16" use 34-36psi for better handling and less burden on the power steering system. If the fluid is leaking out on your garage floor, you have a bad hose or pump seal, but the steering rack seals could be leaking. If any of these are the problem, get tha leak fixed asap, and keep the reservoir full so that you don't burn up the pump.

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1 Answer

I have a 2006 Pontiac G6 where do i refill the power Steering fuild


hi some G6's and i think it's only GT's with a 3.9 liter eng.and the GXP wvith the 3.9 have hydrualic power steering the rest have ELECTRIC POWER STEERING
on your engine cover if it has POWER STEERING PUMP it will have 2 fill caps you can see engine oil and power steering if you only have 1 fill cap then you have ELECTRIC POWER STEERING
hope this helps you

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Try a different grade of oil.Sounds like the oil is the wrong grade.

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