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The discussion today is about how control valves work: All flow control valve, when properly used, always reduces the flow rate from a pump to an actuator. Consists of: A normal flow control valve consists of a valve body and movable part. The movable part in our example is a tapered nose rod which is threaded into the valve body. The movable part in our flow control valve is better described as adjustable since no movement takes place while the valve is operating. How it works: In a hydraulic system, there is many times a direct working relationship between a...

Sundstrand Sauer Danfoss Series 20 How To Tell Bad Valve Plates In diagram #1 you can see there is contamination on the under side of the valve plate. It can cause damage in that can make the plate lift up. This will cause massive leakage and cause damage to the bearing plate also. In diagram #2 can smearing marks on the valve plate. This is cause by poor lubrication, lack of or not proper fluid used in the system and/ or high temperatures. In diagram #3 you can see the grooves that were made between the ports. And you can...

Sundstrand Sauer Danfoss Series 40PV Pump Filtration, MDC & Displacement Limiters In this diagram and chart it discusses theMDCPump filtrationCharge Pump optionsFront ViewSuction FiltrationSide ViewFront ViewBottom ViewDisplacement Limiters Chart All the ports are SAE straight threadOring ports per SAEShaft rotation is figured out by looking at the pump input shaft end. If you need more details about this, call us at 800-361-0068email us at sales@hydrostatic-transmission.com

Sundstrand Sauer Danfoss Series 15 Charge Relief Valve Here are the procedures for replacing the valve.Take out the plug (23) then skim the spring (26) and poppet (27) out of the housing. Don’t do anything to the shims (25) or swap any parts with any other valve.Look over the poppet and seat in the housing for any nicks,burrs or marks on the valve. Also, look for any contamination. If there is, clean your part.After you done all that.. replace parts as needed and put back into the bore housing. IF you need more information on this topic, please give us...

Sundstrand Sauer Danfoss Series 20 Good & Bad Shafts As you can see in diagram number one this shaft has worn splines. It can be caused by not fitting it in correctly or not aligning it up right with the mating coupling. As for diagram number two of this input taper shaft it is great condition.It doesn’t have any nicks, burrs or marks on it. Diagram number three has a fractured taper that has broken into. This again was caused by not properly fitting it the coupling to the shaft or to much torque on the coupling retaining nut. If...