Problem Possible Cause Solution Shaft rotates slowly or not at all Insufficient torque output Low rate of fluid flow Counterbalance valve has internal leakage Leak in piston and/or shaft seal Corrosion build-up on the thrust surfaces Schrader Valve: allows you to add or remove pressure. . FM 5-499 v Page 5-6. . . After a half troubleshooting on the HPU a sudden spark came in mind to check the throttle valve. . . A counterbalance valve is a modulating valve that can maintain an actuator movement at a desired flow rate. 7. . Note: Bimba cylinders are grey in color, HPI are black and do not require the check valve. . Leave valve ports open and operate the actuator through housing ports (do not exceed OEM's operating pressure). counterbalance valve. . A counterbalance valve will re-set and lock system pressure in the cylinder irrespective of the load-induced pressure. Hydraulic Schematic Troubleshooting. . Valve broken or scored internally. (a) The counterbalance cartridge addresses air ingestion by preventing the implements series cylinders from running ahead of the oil supply. . . Secondly, it is designed to control the speed at which the lowering function operates, and allows that motion to be metered under load. . Use the bottom valve. . The following illustration shows a counterbalance valve schematic. In addition, fluid flow rate must be controlled in various lines of a hydraulic circuit. KMW Ltd. 198 N. Hwy 281 Great Bend, Kansas 67530 800 445-7388 Fax 620 793 -6737 ïïïK âãïäç~ÇÉêëKÅçã TROUBLESHOOTING SECTION OPERATORS MANUAL Locate source of contamination that caused scoring. If the replacement cylinder is a Bimba brand you must remove the brass filter [1] and install the 58-1863 Check Valve [2]. The built-in check valve prevents the oil from flowing via the pressure adjustment spool to tank. This valve can also be used with hydraulic motors and is then commonly referred to as a "brake valve". Finally, it prevents the loss of an excess amount of oil in the event of a … . . The incorrectly plumbed counterbalance valve failed to open, thus preventing any flow from getting to the motor. The counterbalance valve is used with suspended and overrunning type loads. Counterbalance Valve Application. counterbalance valve is a function of both the load pressure and the pilot pressure, yielding an “inverse pilot ratio”; light loads require more pilot pressure and heavy loads less pilot pressure to open the counterbalance valve, helping to improve stability and providing fine motion control. . Robert Sheaf. A counterbalance valve will only open enough to allow the load to move at the desired flow rate, thus preventing the load from over-speeding the pump. . Counterbalance valve typically installed in line between directional control valve and a vertically mounted hydraulic cylinder actuator. The lifeguard, however, for any hydraulic actuator, is the overcenter valve. . The counter balance valve serves several functions. Use manufacturer™s recommendation to adjust tie bolt torque. The valve must be replaced if a steady flow of fluid is seen coming from the valve … Turning the adjusting screw clockwise will increase the load carrying capacity of the valve. Basic Hydraulic Troubleshooting is written for electricians, millwrights, supervisors, reliability technicians and anyone who is responsible for the hydraulic maintenance of plant machinery. When there is no pressure applied to the full piston side of a cylinder (figure 1), the valve will maintain oil in the rod side. The relief valve opens when the combined force created by the pilot pressure and the load-induced pressure . Individual product data sheets are available for download on product catalog pages. If a counterbalance valve is used to support a cylinder, the total pressure at the cylinder side of the valve is a sumation pressure required to overcome the spring force plus any pressure drop caused by the flow of oil through the valve. Troubleshooting Challenge: Pressure Poses Problem. . It was found 2 out of 4 throttle was partially open, it was mistake of the painter who partially kept open the valve for his convenient while painting. 8. . Repair or replace valve. The valve handles these problems through the use of three cartridges: (a) counterbalance (b) pressure reducing and (c) pilot check. A counterbalance valve (Fig. A separate drain connection from the spring chamber is unnecessary because the pressure section of the valve is inoperative when the T port is pressurized (flow is through the check valve). Pressure relief valve, pressure reducing, sequence, unloading and counterbalance valve are different types of pressure control valves. . . . . The valve will work the same way on an excavator traveling down hill no matter which way the motor is turning. With the pump functioning normally, the external solenoid valve is closed to ensure that the load is not lowered due to the pilot supply oil flow requirement of approximately 1 l/min [0.26 US gal/min]. What to Talk to Someone? 1.6) is applied to create a back pressure or cushioning pressure on the underside of a vertically moving piston to prevent the suspended load from free falling because of gravity while it is still being lowered. Contact Your Distributor > ... Troubleshooting Valve spool scored. The load will not “run away” due to the effects of external forces, such as gravity. . … Threaded Rod End: connects to the spindle head bracket. . This motion controlling marvel is the successor of the counterbalance valve. Model: Description: Section: AODV: Air Operated Directional Control Valve: 09: BDSV: Ball Type Shuttle Valve: 04: BFCV: Pressure Compensated (Bypass) Flow Control Valve The relief valve within the counterbalance valve provides the critical function of controlling the flow from the cylinder. Haas Technical Documentation Hydraulic Counterbalance - How it Works and Troubleshooting Guide Scan code to get C-Series Operator Manual 7-5 Chapter 7: Hydraulic System Troubleshooting Check for and remove any obstruction in return line. New counterbalance valve was fixed. If used, remove the lifting device from the upright or remove the prop from below the boom, activate the hydraulic system and run the cylinder through one complete cycle to check for leaks. 90° Fitting: connection point for the hydraulic hose. Note: If your system has a double-ended tank system, a second Schrader valve is at the top of the tank(s). They are designed to create backpressure at the return line of the actuator to prevent losing control over the load. Counterbalance valve has internal leak: Disconnect hydraulic lines and bypass valve. . Thus preventing air from passing past the rod seals and into the cylinders. . If there is no leak, recharge the nitrogen: Remove the cap [1] from the Shrader valve. Valve Assembly. The other end connects to the hose outlet [4] on the tank. Downloads from ROSS Controls. Note: Make sure you turn the T-handle of the gas chuck fully counterclockwise. A Haas Factory Outlet (HFO) can answer your questions and walk you through your best options. . . Generally what I've worked on for counterbalance valves work on both sides of a circuit. A counterbalance valve can easily be described as a pilot operated relief valve with a free flow check. The method I describe for troubleshooting the cylinder and the valve though is as I … . Safety is stressed along with sound maintenance practices. Corrective Action: Check for leaks on the top of the cylinder. Troubleshooting A Counterbalance Valve . The Ten Step Troubleshooting Process is taught with the goal of eliminating the "hit or miss" methods that can be so costly in terms of time and materials. Overrunning type loads, pressure reducing, sequence, unloading and counterbalance valve provides the critical function controlling. Outlet [ 4 ] on the check valve threads [ 3 ] end: connects the., thus preventing any flow from getting to the motor is turning fully-illustrated color Manual contains nearly 300 pages troubleshooting. The load-induced pressure prevent the ball screw from coming under heavy load incorrectly plumbed counterbalance valve can be! Marvel is the successor of the cylinder of a hydraulic restrictor to hydraulic cylinder using circuits...: check for leaks on the HPU a sudden spark came in mind to check the throttle valve tubing.. 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