I'm assuming you are talking about the flexible hose that controls the bucket swivel. Mine exploded on me the other day. I ended up grabbing a bucket for all of the hydraulic oil that may have been left in the line and simply loosened off the nuts. For the one end of the hose that connects to the solenoid, you have to loosen the largest nut counter clockwise (left). And for the other end of the hose that connects to the solid steel line, you must turn the second largest nut counter clockwise (left). Try looking for the threads on the valves to determine which nut to loosen.
First locate the drain hose, by opening the rear door and looking at the bottom of the engine the using 2 wrenches 7/8,size or a 7/8 and 3/4 remove the capping nut after the engine has been warmed up
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The hydraulic pressure was reduced when he sprung a leak in the hose.
The whole thing, ends and all needs to be changed, it is a hydraulic line and will blow off under pressure if you don't
A line in the clutch hydraulic system, specifically the only flexible one.
On the right side of the engine compartment there should be a hose coming out from the bottom of the motor with a cap on the end. (it looks like a hydraulic hose) Using a couple of wrenches, one to hold the line and one on the cap, remove the cap and the oil will start coming out. Pull the dipstick out to allow the oil to flow faster. Once the oil is drained put the cap back on, change the filter and refill with new oil. The oil filter is the one on the block just below the throttle linkage and the filter number at NAPA is 1068, use 15W40 oil.
Perhaps coupling and clamps, but always better to replace. A shop fitted with the proper equipment to make hydraulic hoses can.
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Normally you just run your cylinders (loader,steer ect) through their range of movement. The amount of air left in them is minimal. Are you sure there is not a leak in the pickup tube or suction hose that is bringing air into the system. I have had only some experience with hydraulics, so I am a novas myself
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If you need to rev up the engine to get power in the bucket you may have a worn out pump, otherwise something may have gotten into the system and possibly blocked up the safety bypass valve, that would rob all your hydraulic pressure. If you replaced a hose recently it could be foreign matter, OR the hose end was crimped too tightly and the flow is reduced drastically.