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I have a 2002 case 621D loader and while in use one day it…

Customer Question
I have a 2002 case...
I have a 2002 case 621D loader and while in use one day it just stopped. It will start, idle and rev up fine but it has zero hydraulics. No bucket controls, no forward or reverse, and no steering. The filters have all been replaced, the hydraulic oil level is full. When it first starts it will have steering for a split second then nothing.
Submitted: 4 years ago.Category: Construction and Road Equipment
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Answered in 11 minutes by:
11/28/2018
Mechanic: Curtis B., Technician replied 4 years ago
Curtis B.
Curtis B., Technician
Category: Construction and Road Equipment
Satisfied Customers: 43,942
Experience: Technican turned service manager with multiple lines of equipment and rental units.
Verified

Hello! Let's see if we can work together and come to a satisfactory conclusion!

Has the coupler from the engine flywheel been damaged, and is no longer turning the output to the transmission and hydraulics?

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Mechanic: Curtis B., Technician replied 4 years ago

Is the drive shaft spinning between the torque converter and the transmission?

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Customer reply replied 4 years ago
the driveshaft from the engine is still spinning.
Mechanic: Curtis B., Technician replied 4 years ago

Is it turning the input shaft or is it stripped out?

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Customer reply replied 4 years ago
Did some inspecting today and the input is definitely turning, also pull the pump off the front a bit to inspect the input into the pump and that turns as well. Replaced a broken solenoid and now we have forward and reverse but still no bucket or steering. I put a hydraulic tester on the two test ports in the main block in the front ( i believe they call it the main relief and the pilot ) both have zero hydraulic pressure.
Mechanic: Curtis B., Technician replied 4 years ago

You say you found a broken solenoid? Was it damaged by a blow? Could there be more damage to another harness in the same area as all quit at the same time?

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Customer reply replied 4 years ago
It wasn't physically damaged, it just wasn't functioning. Visually the rest of them look fine.
Mechanic: Curtis B., Technician replied 4 years ago

OK, just seems odd that it would lose the functions at the same time and now you have the drive back. With zero pressure to the hydraulic functions, is the pump turning?

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Customer reply replied 4 years ago
After talking to the operator the forward/reverse was an ongoing intermittent issue. The gauge I have starts at 100psi, so it might have some hydraulic pressure but it's less than 100. I pulled the pump back a little bit so I could verify the pump is turning and it definitely is
Mechanic: Curtis B., Technician replied 4 years ago

Is the pump moving fluid?

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Customer reply replied 3 years ago
I do not have access to a flow meter but there does seem to be some fluid movement. My best guess is its not enough seeing as it isn't registering any pressure
Mechanic: Curtis B., Technician replied 3 years ago

Pump suction is good? Not sucking air?

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Customer reply replied 3 years ago
All filters where changed and the fluid does not appear to be aerated at all.
Mechanic: Curtis B., Technician replied 3 years ago

The pump may have failed.

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Satisfied Customers: 43,942
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