Évaluations - 5, GPA: 3.6
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Facilité d'utilisation
Together, the two gear sections create a large volume flow which produces rapid cylinder movement under low load conditions. Above unloading pressure, a pilot pressure line(which simulates actual pressure at the cylinder) activates the unloading valve, which causes the flow to bypass the large gear section and return to the pump inlet area. The small gear section is now operating alone, and will generate the higher pressure necessary for the actual log splitting operation. The original factory setting for the unloading valve is designed to provide maximum flow while remaining below engine stalling load. Note: Splitting capability is not affected by the setting of the unloading valve. Do not attempt to adjust or reset It without a pressure gauge (should be performed by an authorized SEARS Service Center only). THE DIRECTIONAL VALVE AND CYLINDER From the pump, oil flows to a four way, three position directional valve. At the neutral position this valve directs the flow back to the oil reservoir, bypassing the cylinder. When the directional valve is directing the flow to the back of the cylinder, the cylinder rod extends quickly until it meets significant resistance. Upon reaching unloading pressure, movement of the shaft will slow but will continue forward. If the pressure reaches a preset maximum (called relief valve pressure) the relief valve, located within the directional valve, will allow the flow to bypass the cylinder and return to the reservoir. This can happen when the cylinder rod meets excessive resistance, or when it reaches the end of its stroke and can move no farther. Note: Never operate at relief valve pressure for more than a few seconds. When the directional valve is directing the flow to the front of the cylinder, the rod will retract quickly since it is encountering no resistance. The relief valve will momentarily bypass the flow at the end of the return stroke but the directional valve should then automatically return to the neutral position, directing the flow directly into the reservoir. This serves to protect the pump from possible damage due to prolonged operation at relief valve pressure. Because of the potential for system damage, the relief valve is carefully and precisely preset by the manufacturer. Note: The user should not attempt to adjust or change the setting of the relief valve. OPERATIONAL PROBLEMS If you have trouble with your log splitter, please refer to the Hydraulic Trouble Shooting Guide on page 19. Note: Readjustment of valves or disassembly of pump should be performed by your SEARS Service Center only. 18 HYDRAULIC TROUBLE SHOOTING GUIDE Problem Probable Cause(s) Corrective Action Cylinder rod will not move A Broken driveshaft B Loose shaft coupling C Gear sections damaged D Damaged relief valve E Hydraulic lines blocked F Too little oil to pump G Damaged directional valve H Blocked directional valve A Return unit for authorized repair B Correct engine/pump alignment as necessary C Return unit for authorized repair D Return directional valve for authorized repair E Flush and clean hydraulic system F Add oil to reservoir G Return unit for authorized repair H Flush and clean hydraulic system; return unit for authorized repair Slow cylinder shaft speed while extending and retracting A Gear sections damaged B Excessive pump inlet vacuum C Slow engine speed D Damaged relief valve E Too little oil to pump F Air in oil G Directional vaive leaking internally H Internally damaged cylinder A Return unit for authorized repair B Make certain pump inlet hoses are clear and unblocked—use short, large diameter inlet hoses C Return unit for authorized repair D Return unit for authorized repair E Add oil to reservoir F Add oil, clean reservoir, make certain oil return tube is below oil level G Return unit for authorized repair H Return unit for authorized repair Engine runs but wood will not split, or wood splits too slcwly A Small gear section damaged B P^jmp check valve leaking C Excessive pump inlet vacuum D Low relief valve setting E Too little oil to pump F Air in oil G Directional valve leaking internally H Overloaded cylinder I Internally damaged cylinder A Return unit for authorized repair B Return unit for authorized repair C Make certain pump inlet hoses are clear ana unblocked; use short, large diameter inlet hoses D Adjust valve while using pressure gauge* E Add oil to reservoir F Add oil, clean reservoir, make certain oil return tube is below oil level G Return unit for authorized repair H Do not attempt to split wood against the grain I Return unit for authorized repair Engine stalls during splitting A Low horsepower/weak engine B High relief valve setting C High unloading valve setting D Overloaded cylinder A Return unit for authorized repair B Adjust valve while using pressure gauge* C Adjust valve while using pressure gauge* D Do not attempt to split wood against the grain Engine will not turn or stalls under low load conditions A Engine/pump mis...