What causes an excavator to slow down under load?

If its not turning fast enough, your not moving as much oil which will slow your machine down. If it pulls down under a load you could have a plugged fuel filter or air filter. If engine rpm drops when you bottom out a cylinder then you could have something causing your pump to put out too much flow.

What should the cycle time be on an excavator?

Run a cycle time on the boom up function. Stretch out the stick, open the bucket and set it on the ground. Now with the engine at full throttle, snap the boom control to full up and then time how long it takes to top out. It should be about 4 seconds or less. 4.5 seconds is getting slow while 3.5 seconds is very fast.

What should be the speed of an excavator engine?

It should be about 4 seconds or less. 4.5 seconds is getting slow while 3.5 seconds is very fast. The other item to check is the fuel strainer in the priming pump suction fitting on the engine. They always have a brass or plastic strainer in the banjo bolt that plugs up over time.

Is there a hydraulic problem on a Kubota excavator?

I have the workshop manual, can email you the hydraulic diagramm. It has a button, but it happened in slow speed. I started the engine 1 minute before, try to backout, was wrong direction. I travelled forward instead of backward. I changed very fast like a reflex. Welcome to JUST ANSWER heavy equipment.

What kind of controls do you use on a John Deere Excavator?

Luckily, switching the control pattern on a John Deere excavator is quick and easy to do. When using ISO controls (excavator controls or John Deere controls), the right-hand controls the stick and bucket motions; the left-hand controls the swing and the boom. SAE controls (backhoe controls or CAT controls) are the opposite.

Why is my excavator moving so slow?

The hydraulic system is one of the power systems of the excavator. If the excavator moves slowly, check whether the hydraulic system is maintained on time and whether the hydraulic oil is replaced regularly.

What happens if you have expired hydraulic oil in your excavator?

Expired hydraulic oil will not only affect the working effect of the excavator, but also corrode the hydraulic oil circuit and hydraulic components of the excavator. At the same time, check whether the hydraulic oil circuit and return filter element are blocked.

How long does it take an excavator to top out?

Stretch out the stick, open the bucket and set it on the ground. Now with the engine at full throttle, snap the boom control to full up and then time how long it takes to top out. It should be about 4 seconds or less. 4.5 seconds is getting slow while 3.5 seconds is very fast.

Is the Komatsu pc75uu-2 a gray market machine?

The 75UU-2 is most likely a gray market machine if it’s wierd colors, like purple and blue, stuff like that. But no worries, I’ve never had any problems getting parts for them in my area from local Kommie dealer. They are fairly solid machines, nothing is easy to get to for repairs though, but that’s typical of any zero tail swing machine.

What causes a cat 325C excavator to run slower?

(When it sees pressure) If no pressure can get to the control head (lines blocked) the flow should remain constant. (same speed for both tracks) If a NFC is leaking, this leakage will send pressure to the control head and limit pump output. (slower flows on that pump)

Which is the smallest hydraulic excavator on the market?

The smallest hydraulic excavators (with seats for operators) indeed are small. They are narrow and short enough to be driven through doorways. They’re powered by engines of 10 to 15 hp and weigh just a ton, more or less.

Which is faster left side or right side track?

in backup mode, machine tracks perfect at idle. At high rpm, right side lags a little with straight travel pedal all the way stroked. When straight travel pedal is only partially stroked, the right side is faster sometimes, depending on position of pedal. That points back to the pump control head.

Are there any electric mini excavators on the market?

The hybrid’s three-phrase electric motor roughly produces the equivalent digging power of its diesel model (which, by the by, is a three-cylinder Yanmar). Cat introduced the hybrid in 2017 and, so far, sales of the unit are far less than the conventional 300.9D, according to Worley. He calls it “a niche opportunity but a growing one.”

Can a clogged intake line cause a hydraulic failure?

In extreme cases, cavitation can cause mechanical failure of system components. While cavitation can occur just about anywhere within a hydraulic circuit, it commonly occurs at the pump. A clogged inlet strainer or restricted intake line will cause the fluid in the intake line to vaporize.

What causes a hydraulic cylinder to drift down?

A popular misconception about hydraulic cylinders is that if the piston seal is leaking, the cylinder will drift down.

What causes the reverse spool end of a hydraulic cylinder to stick?

1. Check installation drawings. 2. Check parts and drawings. 3. Reverse spool end for end. CYLINDERS TROUBLE CAUSE REMEDY ERRATIC ACTION 1. Valves sticking or binding 2. Cylinder sticking or binding 3. Sluggish operation during warm-up period 4. Pilot control pressure too low 5. Internal leakage in cylinder 6. Air in system 1.

A popular misconception about hydraulic cylinders is that if the piston seal is leaking, the cylinder will drift down.

What causes a hydraulic system to lose lubrication?

Aeration accelerates degradation of the fluid and causes damage to system components through loss of lubrication, overheating and burning of seals. Air usually enters the hydraulic system through the pump’s inlet. For this reason, it is important to make sure pump intake lines are in good condition and all clamps and fittings are tight.

What causes a cylinder to become hydraulically locked?

In this condition, due to the unequal volume on either side of the piston, fluid pressure equalizes and the cylinder becomes hydraulically locked. Once this occurs, the cylinder can move only if fluid escapes from the cylinder via the rod seal or its ports. Figure 1. Double-rod cylinder – oil volume is equal on both sides of the piston

Why is cat 325C excavator 5500hrs slower than specifications?

When you are holding the lift at relief, the straight travel valve spool is shifted and one pump is for implement control and the other is for travel. This is why the machine slows when operating a function while traveling. How is the bucket cycle times? If it is slower than specifications, this would indicate the problem is in the right pump.

What causes an excavator to slow down under load?