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Looking at the rear of the tractor from the outside there's a cap in the center about 4 inches below the height of the small square window
Anyplace that sells this filter can cross reference it for you.
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Remove the fill plug and top it off with hydraulic oil.
On the slightly newer CK20S, if you are sitting in the tractor seat, the hydraulic fluid fill will be near your right hand as you reach down below the seat. It has a red cap on it that says "oil". This is NOT the engine oil, but rather the hydraulic oil.
hydraulic oil,AW-300
When you pour it in the crankcase fill spout.
Relieves pressure buildup in the system, and it gives the excess oil a place to go.
The primary type of hydraulic oil used in case backhoes is 10wt or AW-46. Each type has specific properties for longevity, performance, and resistance to harsh temperatures.
The fill port is below the seat on the right hand side.
There could be a few possible reasons for hydraulic oil spilling from the fill cap when dumping a dump truck. One reason could be that the hydraulic system is overfilled, causing excess pressure and resulting in oil leakage. Another possibility could be a faulty or damaged fill cap, causing inadequate sealing. It is also important to check if the dump truck is tilted or positioned unevenly during dumping, which could lead to oil spillage from the fill cap.
On the housing there is a plug and you take it off and put ameba muti g 134 oil in it