Log Splitter Hydraulic Troubleshooting
Contents
1. l Steel Rule ane PS Filler Opening Figure 2 K amp T Saw Shop 606 678 9623 or 606 561 4983 3 www mymowerparts com Inspect the coupler assembly between the engine and the pump in the following sequence See Figure 3 Set Screw 3 i i Coupler Assembly Figure 3 NOTE Make certain the spark plug wire has been removed from the spark plug and it is grounded to the engine block Simply grasp the coupling assembly by hand and make certain the engine crankshaft and pump input shaft rotates with the coupling Make certain the set screws in the upper and lower coupling halves are tight using an 1 8 allen wrench NOTE Remove and loctite the set screws if they are loose Log Splitter Hydraulic Troubleshooting Make certain there is a square key between the engine crankshaft and the upper coupling half see Figure 4 Figure 4 Make certain there is a half moon key between the pump input shaft and the lower coupling half See Figure 5 Half Moon Key Nylon Spider Figure 5 NOTE Refer to the Flexible Coupler Adjustment Section for instructions Make certain there is a nylon spider insert between the upper and lower coupling halves K amp T Saw Shop 606 678 9623 or 606 561 4983 www mymowerparts com Log Splitter Hydraulic Troubleshooting 8 Loosen the hose clamp securing the suction 12 Start the engine and verify that the engine is hose to the hydraulic ge2. or LESS than the GPM A recorded earlier in the Pump Trou bleshooting section Final Pump Pressure Test the hydraulic fluid flow is correct If the recorded GPM B is GREATER than the GPM A recorded earlier in the Pump Trouble shooting section Final Pump Pressure Test there may be a problem with the control valve pressure relief valve or hydraulic cylinder Enter the recorded test results from PSI A and PSI B If the PSI B is equal to or greater than the recorded PSI A in the Final Pump Pressure Test the hydraulic system is functioning cor rectly If the PSI B is less than the recorded PSI A in the Final Pump Pressure Test there may be a problem with the control valve pressure relief valve or hydraulic cylinder Continue through this section to determine which part is faulty Log Splitter Hydraulic Troubleshooting 13 Move the control valve to reverse and retract the wedge assembly 14 Shut the log splitter off and relieve the pressure in the hydraulic system by cycling the control valve handle forward to reverse several times 15 Remove the test kit from the log splitter using a 7 8 wrench 1 1 8 1 1 16 and a large adjust able wrench Figure 4 16 Install the high pressure hydraulic hose in the inlet port of the control valve using a 1 1 16 wrench and channel locks See Figure 5 High pressure lin re installed in Figu
3. sure 2 Rotate the needle valve counter clockwise to the como elei open Cosin T Start the engine and move the throttle if p y Open p equipped to fast 3 Remove the hex bolt covering the pressure relief valve using a 5 8 wrench NOTE Most log splitters do not have a throttle control they are set to run fast all the time spect EA Cn EAE 8 Move the control valve handle to the forward or wear ee position until the wedge assembly is at the end of 5 Mark the orientation of the adjustment screw on its travel the outer housing using a flashlight and a sharp object 9 24 K amp T Saw Shop 606 678 9623 or 606 561 4983 9 10 11 12 13 14 15 16 www mymowerparts com Hold the control valve handle in the forward posi tion and begin to close the needle valve See Figure 3 Close needle valve slowly then open quickly after taking reading Figure 3 Momentarily close the needle valve completely record the PSI gauge and immediately open the needle valve back up CAUTION This step must be performed very quickly or damage may occur to the hydraulic system Record the PSI The new pressure read ing is and replaces the previous reading PSI O Enter the recorded test results from PSI B and the new PSI C If the recorded PSI C is equal to the PSI recorded earlier PSI B the pressure relief valve is functioning correctly and this is now t
4. wrench 7 8 wrench and a large adjust able wrench Double check all connectors and make certain they are tight before performing the test proce dures Secure the open end of the small high pressure hydraulic hose to the 90 degree fitting on the control valve using two 7 8 wrenches Test Procedures IMPORTANT When instructed to close the nee dle valve extreme caution must be exercised Leaving the needle valve closed for more than a few seconds can blow seals and damage the log splitter Scan the above section and enter the recorded test result from PSI B Rotate the needle valve counter clockwise to the completely open position Start the engine and move the throttle if equipped to fast NOTE Most log splitters do not have a throttle control they are set to run at full throttle Move the control valve handle to the forward position until the wedge assembly is at the end of its travel Hold the control valve handle in the forward posi tion and begin to close the needle valve Log Splitter Hydraulic Troubleshooting 10 11 12 9 23 Momentarily close the needle valve completely record the PSI gauge and immediately open the needle valve back up See Figure 1 _ See N Ba Close needle valve slowly then open quickly after taking reading Figure 1 CAUTION This step must be performed very quickly or damage may occur to the hydraulic system Record the PSI This is PS
5. 1500 and 3200 PSI 3 Move the control valve handle to the forward 3 Record the GPM This is GPM A position until the wedge assembly is at the end of NOTE The GPM A should be approximately 1 TS Meh eee igus GPM 4 Immediately open the needle valve NOTE Damage to the pump can be avoided by opening the needle valve immediately after recording the test results 5 If the PSI reading is below 1500 PSI and the GPM is above 1 to 2 the pump is defective REPLACE THE PUMP 6 Shut the log splitter off If all the recorded data meets the specifications above perform the following section 1 gt A gt SSS Hold control valve in FORWARD position Control Valve and Hydraulic Cylinder Trou bleshooting M Figure 2 NOTE This section is to be used after the Gen eral Inspection and Pump Troubleshooting sec 4 Hold the control valve handle in the forward posi tions have been performed tion 9 20 K amp T Saw Shop 606 678 9623 or 606 561 4983 5 10 11 12 www mymowerparts com Record the PSI This is PSI B See Fig ure 3 nn oe es A s T Low flow high pressure Figure 3 NOTE The PSI B recorded should be equal to or GREATER than the PSI A recorded earlier in the Pump Troubleshooting section Final Pump Pressure Test Record the GPM This is GPM B Enter the recorded test results from GPM A and GPM B If the recorded GPM B is equal to
6. I C Enter the recorded test results from PSI B and PSI C If the recorded PSI C is equal to the PSI recorded earlier PSI B the pressure relief valve is functioning correctly If the recorded PSI C is equal to the PSI recorded earlier PSI B but exceeds the 3200 PSI limit the Pressure Relief Valve Adjustment section must be performed to lower the PSI If the recorded PSI C is below the PSI recorded earlier PSI B the Pressure Relief Valve Adjustment section must be performed in an attempt to bring the PSI back into the correct specifications before condemning the control valve Shut the log splitter off K amp T Saw Shop 606 678 9623 or 606 561 4983 www mymowerparts com Log Splitter Hydraulic Troubleshooting Pressure Relief Valve Adjustment 6 Depending on the log splitter pressure turn the adjustment screw clockwise or counterclockwise 1 8 of a turn using a flat blade screw driver See Figure 2 Sqrewdriyer f Counterclockwise Jii DECREASES Clockwise w arsi INCREASES cm i pressure pressure Figure 1 IMPORTANT This adjustment is extremely sen Figure 2 sitive Slowly turn the adjustment screw one eighth of a turn at time and recheck the pressure NOTE Turning the adjustment screw clockwise increases the pressure Turning the adjustment 1 Enter the recorded test results from PSI p screw counter clockwise decreases the pres
7. ar pump using a 5 16 operating between 3500 and 3600 RPM using a socket or a flat blade screw driver See Figure 6 tachometer See Figure 8 Figure 8 9 Momentarily remove the suction hose from the NOTE See the engine service manual for cor bottom of the pump and lower it into an oil drain rect RPM specifications and procedures container making certain there is sufficient flow i 13 Shut the engine off from the reservoir See Figure 7 Pump Troubleshooting Fa N 1 Latch the log splitter in the horizontal posi tion See Figure 1 Pump High A Pressure ce m ae messi Low Pressure Hose WASTE oiL amp GAS _ Figure 7 10 Quickly reconnect the suction hose and secure it in place using a 5 16 socket its mi ni ARAY eA ches uum ry Ae shies os Figure 4 11 Check the fluid level and replace the lost igur fluid 9 16 K amp T Saw Shop 606 678 9623 or 606 561 4983 www mymowerparts com Log Splitter Hydraulic Troubleshooting 2 With the log splitter off cycle the control valve Test Kit Installation Procedures forward and rearward several times to relieve any pressure in the hydraulic system See NOTE The pressure gauge side of the test kit connects to the pump s high pressure hydraulic hose and the flow gauge side of the test kit con nects to the inlet port of the control valve See Figure 1 Figure 2 Male Union to control valve e Fema
8. he Final PSI C Continue to the Hydraulic Cylinder Troubleshooting section If the recorded PSI C is equal to the PSI recorded earlier PSI B but exceeds the 3200 PSI limit the Pressure Relief Valve Adjustment section must be performed to lower the PSI If the recorded PSI C is below the PSI recorded earlier PSI B the Pressure Relief Valve Adjustment section must be performed in an attempt to bring the PSI back into the correct specifications before condemning the control valve Shut the log splitter off Log Splitter Hydraulic Troubleshooting 17 Repeat the above section and continue to make eighth turn adjustments until the correct pressure relief specifications have been achieved NOTE Always shut the log splitter off when mak ing adjustments 18 Ifthe pressure relief valve has been adjusted to the correct specifications the control valve is good Perform the Hydraulic Cylinder Trouble shooting section 19 Ifthe pressure relief valve will not adjust to the correct specifications REPLACE THE CON TROL VALVE See Figure 4 Figure 4 20 Shut the log splitter off Hydraulic Cylinder Troubleshooting IMPORTANT This section is to be performed after all the other Test Kit sections have been performed 1 Enter the recorded test results from the reading Final PSI C l 9 25 K amp T Saw Shop 606 678 9623 or 606 561 4983 www mymowerparts com Log Splitter Hydra
9. his test Record the GPM of the fluid flow at the flow meter See Figure 4 Figure 5 9 Record the PSI NOTE The PSI reading should be between 300 and 700 PSI 10 Record the GPM NOTE The GPM reading should be between 1 and 3 GPM IMPORTANT If the check valve does not close the engine will bog down and stall REPLACE THE PUMP 11 If all the recorded data meets the specifications above proceed CAUTION The next test requires the needle valve to be almost fully closed It must be opened immediately after recording the test results to avoid damage Figure 4 NOTE The flow meter should read between 8 and 14 GPM gallons per minute if the pump is operating correctly 9 19 K amp T Saw Shop 606 678 9623 or 606 561 4983 www mymowerparts com Log Splitter Hydraulic Troubleshooting Final Pump Pressure Test Scan the Final Pump Pressure Test section and l l enter the recorded test result from PSI A 1 Continue to close the needle valve slowly until and GPM A the flow gauge reads approximately 1 OO GPM see Figure 1 Test Procedures 1 Make certain the needle valve is fully open see Figure 1 Figure 1 Needle valve Open ere Y NOTE DO NOT close the needle valve fully This is the main pressure hose and the pump does not have a relief valve Figure 1 2 Record the PSI This is PSI A 2 Start the log splitter NOTE The PSI A should be between
10. le union to high pressure hose Figure 2 Male union 3 Remove the high pressure hydraulic hose from 3 the inlet port of the control valve using channel Figure 1 locks and a 1 and 1 8 wrench NOTE Make certain that any dirt or debris is removed from the hydraulic connections before they are loosened Control Valve to Flow Meter Connector 1 Secure the male union to the inlet side of the control valve using a 1 1 8 wrench and a large adjustable wrench to hold the control 4 Set the high pressure hydraulic hose into an oil valve drain container 2 Secure the male union to the flow meter connec tor using a 1 1 8 wrench and a 7 8 wrench See Figure 2 Figure 2 9 17 K amp T Saw Shop 606 678 9623 or 606 561 4983 www mymowerparts com Log Splitter Hydraulic Troubleshooting High Pressure Hydraulic Hose to Pressure valve that is used on the test kit the GOLD ring Gauge Connector below the needle valve knob will be exposed or the number 4 will be showing on the center indi 1 Secure the male union female union and high cator See Figure 2 pressure hydraulic hose connector to the pres sure gauge connector using a 1 1 8 wrench 1 1 16 wrench 7 8 wrench and a large adjust able wrench 2 Double check all connectors and make certain they are tight before performing the test proce dures Test Procedures IMPORTANT When instructed to close the nee dle valve extre
11. me caution must be exercised Leaving the needle valve closed can blow seals and damage the log splitter See Figure 1 High PSI when running ee a Figure 2 2 Start the engine and move the throttle if equipped to fast NOTE Most log splitters do not have a throttle control they are set to run at full throttle at all times Needle Valve Closed Figure 1 1 Open the needle valve completely by turning the knob counter clockwise NOTE The needle valve MUST be open before starting the log splitter Depending on the needle 9 18 K amp T Saw Shop 606 678 9623 or 606 561 4983 www mymowerparts com Log Splitter Hydraulic Troubleshooting Check the engine RPM with a tachometer and 6 Record the pressure of the fluid at the pressure make certain the engine is running between gauge 3500 and 3600 RPM see Figure 3 NOTE The pressure gauge should read 0 PSI pounds per square inch if the pump is operat ing correctly T Slowly close the needle valve clockwise until the engine begins to labor 8 Continue to close the needle valve slowly until the high volume check valve closes and the engine RPM returns to normal See Figure Figure 3 NOTE If the engine is not running to specifica tions the test results will not be valid See the engine service manual to correct the engine RPM The log splitter must be run for a short time to bring the hydraulic fluid up to 130 degrees Fahr enheit before continuing t
12. p T Saw Shop 606 678 9623 or 606 561 4983
13. re 5 9 21 K amp T Saw Shop 606 678 9623 or 606 561 4983 www mymowerparts com Log Splitter Hydraulic Troubleshooting Control Valve Pressure Relief Valve and Hydraulic Cylinder Testing 1 Make certain the wedge assembly is in the fully retracted position see Figure 1 Figure 1 2 Place the log splitter in the vertical position and lock it in 3 Remove the steel hydraulic tube that connects from the rear port of the hydraulic cylinder to the 90 degree fitting on the control valve using two 7 8 wrenches see Figure 2 90 degree fitt Steel hydraulic t i i Whee T vie Figure 2 Install the Test Kit in the following sequence To rear port of hydraulic cylinder Flow side of kit To control valve outlet Pressure side of kit Figure 1 NOTE The pressure gauge side of the test kit connects to the control valve and the flow gauge side of the test kit connects to the rear port of the hydraulic cylinder Rear Cylinder Port to Flow Meter Connec tor 1 secure the flow gauge connector directly to the rear port of the hydraulic cylinder using a 7 8 wrench 9 22 K amp T Saw Shop 606 678 9623 or 606 561 4983 www mymowerparts com Control Valve 90 Degree Fitting to Pres sure Gauge Connector 1 Secure the male to female union male union and small high pressure hydraulic hose to the pres sure gauge connector using a 1 1 8 wrench 1 1 16
14. ulic Troubleshooting 2 Rotate the needle valve counter clockwise to the completely open position See Figure 5 Needle valve in Open position Figure 5 3 Start the engine and move the throttle if equipped to fast NOTE Most log splitters do not have a throttle control they are set to run at full throttle 4 Move the control valve handle to the forward position until the wedge assembly is at the end of its travel 5 Hold the control valve handle in the forward posi tion Record the PSI This is PSI D T Record the GPM 8 Enter the recorded test results from Final PSI G and PSI D 9 If the recorded PSI D is EQUAL to the PSI recorded earlier PSI C and the recorded GPM is between 0 and 1 the cylinder is good 10 Ifthe recorded PSI D is LESS than the PSI recorded earlier Final PSI C and the recorded GPM is 2 to 3 or more the hydraulic cylinder needs to be repaired NOTE Seal kits are available from your parts suppliers See Figure 6 Seals x Piston Figure 6 11 Replace the hydraulic cylinder ONLY if repairs are not possible 12 Remove the hydraulic log splitter test kit using a 7 8 wrench 1 1 16 wrench 1 1 8 wrench and a large adjustable wrench 13 Install the steel hydraulic tube that connects from the rear port of the hydraulic cylinder to the 90 degree fitting on the control valve using two 7 8 wrenches K am
15. www mymowerparts com Log Splitter Hydraulic Troubleshooting Log Splitter Hydraulic Troubleshooting Test Kit 759 3742 Test Kit Components See Figure 1 5 a F hake pe T Ys 8 Flow Meter y Needle Valve Pressure Gauge Figure 1 IMPORTANT The following test kit information and systematic questioning allows diagnoses of the hydraulic log splitter Proper testing and maintenance procedures provide safe and effec tive methods to do these tests Use the blank lines to verify a performed step or record a test result Make certain all the test results are recorded there will be a need to refer back to them throughout this test General Inspection IMPORTANT Always disconnect the spark plug wire from the spark plug and ground it to the engine block when the log splitter is not being run 9 14 As a standard service procedure replace the hydraulic oil filter See Figure 1 ik Na t as iy SN bA Xx i F t Filter Figure 1 NOTE When installing the hydraulic oil filter lubricate the seal with hydraulic fluid rotate the filter clockwise by hand until it is snug and com plete the installation by rotating the filter 1 8 of a turn clockwise beyond the snug position Check the fluid level and add or remove fluid as required NOTE Check with the owner to find out what fluid is being used in the hydraulic log splitter DO NOT mix hydraulic fluids See Figure 2
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