1.    Low oil level

2.    Brakes dragging

3.    Mechanical failure in reverser

4.    Converter drive tangs sheared or not engaged in pump

5.    Pump gears seized

6.    Mechanical failure in trans axle

7.    Trans axle shifter forks and/or shaft broken

8.    Differential ring gear teeth sheared

9.    Final drive shaft and pinion broken

Why won’t my reverser shift (310 C or D)?

1.    FNR switch failure

2.    Disconnect clutch not functioning properly

3.    Reverser clutch disk slipping

4.    Mechanical failure in reverser

5.    Worn or broken sealing rings in reverser brake piston

My reverser will not disconnect (310 C or D).

1.    Disconnect clutch not functioning properly

2.    Directional control valve solenoid spring stuck or broken

3.    Warped or dragging clutch pack

4.    Worn or broken sealing rings in forward clutch of reverser

5.    Clutch plates worn or broken

Why would my 4WD Loader (E or G) creep in neutral?

1.    Warped disks and plates in transmission

       My 4WD loader is foaming oil.

1.    Incorrect type of oil

2.    High oil level or low oil level

3.    Air leak on suction side of pump

When shifting in forward to reverse the transmission pressure light comes on in my 4WD Loader (E or G).

1.    Low oil level

2.    Leak in reverse pack

My transmission pressure is low in all gears on my 4WD Loader (E or G).

1.    Low oil level

2.    Plugged suction strainer

3.    Stuck transmission pressure regulating valve or broken spring

4.    Failed control valve gasket

5.    Stuck or missing clutch cut-off pilot orifice can cause control valve housing to be damaged and the modulation spool to stick

Why doesn’t my 4WD Loader (E or G) move?

1.    Worn out clutch disks

2.    Low or no transmission pressure

3.    Park brake or misadjusted park brake switch

4.    Stock control valve spool

5.    Failed torque converter

6.    Control valve lines are crossed

Why would my 4WD Loader (E, G, H, or J) differential over fill with oil?

1.    Differential lock pressure oil leaking at piston seals

2.    leak in brake piston seals

3.    Incorrect breather tube

Why would my 4WD Loader (E, G, H, or J) not have differential lock operation?

1.    Malfunction in electrical circuit

2.    Stuck differential lock solenoid valve

3.    Malfunction in pressure reducing valve or setting low

4.    Excessive leakage in differential lock sealing ring

5.    Stuck differential lock piston

6.    Excessive wear on differential lock disks and plates

My 4WD Loader (E, G, H, or J) has excessive differential and/or axle noise.

1.    Low oil level in differential

2.    Dragging brakes

3.    Engaged differential lock

4.    Failed pinion bearing

5.    Incorrect gear mesh pattern between ring and pinion gear

6.    Failed differential pinion gears and/or cross shafts

7.    Failed axle bearing

8.    Mechanical failure in axle planetary

1.    Rod scratched, gouged or bent

2.    Seals worn or damaged

3.    Fittings not tight or damaged

4.    Check for weld joints leaking

Why does cylinder not operate properly or drift?

1.    Piston seals worn or damaged

2.    Control valve not operating properly

3.    Contamination in hydraulic system

4.    Inside of hydraulic cylinder barrel scored or scratched

Why are hydraulic cylinder seals failing prematurely?

1.    Hydraulic system over heating

2.    Contamination in system

3.    System pressure too high

4.    Cylinder rod bent or scratched

5.    Inside of barrel scratched

My loader (444 – 544 – 644, A, B, C and D) lacks power and acceleration at low speed.

1. Low main pressure
2. Low clutch apply pressure
3. Clutch failed (won’t release)
4. Turbine freewheel clutch failed
5. Engine Malfunction
6. Aerated oil

My loader (444 – 544 – 644, A, B, C and D) will not travel.

1. Low main pressure
2. Low clutch apply pressure
3. Selector linkage broken or disconnected
4. Internal mechanical failure

Why does my loader (444 – 544 – 644, A, B, C and D) travel while in neutral when engine is accelerated?

1. Selector linage out of adjustment
2. Clutch failed (won’t release)

I have low main pressure on my 4WD Loader (444 – 544 – 644, A, B, C and D).

1. Low oil level
2. Clogged oil strainer
3. Clogged oil filter
4. Weak or broken main pressure regulator valve spring
5. Oil pump broken
6. Air leak at intake side of oil pump
7. External oil leakage

My 892D/E or 790D hydraulic pump is dragging my engine down or stalling it out.

1. The horsepower adjustment is set to high

My 892D/E or 790D tracks are running out of synch with each other.

1. Check track time on each side to determine which side is out and make a horsepower adjustment on the pump that operates the out of time track.

My 992E hydraulic pump produces low flow but the rotating group is good.

1. Swash plate cradles are worn and not getting a good seal.

My propel and swing motors have consecutive blown shaft seals.

1. Clogged case drain line
2. Pressure relief malfunctioning

My 790E hydraulic pump will not fully swash or stays in full swash and will not de-stroke.

1. Angle sensor is out of adjustment
2. Solenoid valve is bad
3. Speed sensor is bad or has broken leads

I have a rebuilt rotary manifold but it is leaking.

1. Make sure the pane is clean of all residual oil from previous failure
2. Check all lines and fittings

The housing on my swing motor is cracked in around the head bolt holes.

1. Clogged case drain line
2. Pressure relief malfunctioning

My swing motor does not operate.

1. Pilot circuit malfunction
2. Swing brake release valve malfunction
3. mechanical failure of swing motor or gearbox

My swing motor does not stop.

1. Brake disk worn
2. Brake valve malfunction
3. Pilot circuit malfunction

My hydraulic oil is over heating

1. Low oil level
2. Plugged oil cooler
3. Oil viscosity too low
4. Pump stuck in full stroke