MTD 27-Ton Manuel de service

Professional Shop Manual2010 and Newer Log SplitterNOTE: These materials are for use by trained technicians who are experienced in the service and rep

2010 Log Splitters6NOTE: If the engine is not being replaced, skip to step 10.7. Remove the set screw in the engine coupling using a 1/8” hex key. See

Engine and pump7Vertical shaft enginesTo remove/replace the engine:1. Remove the three engine mounting screws using a 1/2” wrench.2. Remove the engin

2010 Log Splitters8Engine coupler gapMTD uses jaw type couplers to connect the engine to the pump. Jaw type couplers are made of three parts; two meta

Engine and pump9Pump removal/replacementTo remove the pump:1. Place a suitable container, large enough to hold all of the fluid in the reservoir under

2010 Log Splitters107. Remove the set screw that secures the pump cou-pling half using a 1/8” hex key. See Figure 2.13.8. Remove the coupling and the

Hydrualic Diagnosis11OVERVIEWThe main components of the log splitter are all fairly expensive. Hip-shot diagnosis will result in wasted time and money

2010 Log Splitters12Understanding the hydraulic flowIt starts at the reservoir (tank). See Figure 3.2.• The tank acts as the axle of the log splitter.

Hydrualic Diagnosis13 The pump draws fluid from the tank, and forces it under pressure to the control valve. See Figure 3.4.• The pump is capable

2010 Log Splitters14The open-center control valve does four things: See Figure 3.6.1. Regulate: It regulates fluid pressure. • If the pressure exceeds

Hydrualic Diagnosis15The Cylinder See Figure 3.7.• Both ports of the cylinder are connected to the control valve. • When pressure is applied to the po

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2010 Log Splitters16Log splitter test procedures1. PreparationTroubleshooting and diagnosing a hydraulic system is a process that should be performed

Hydrualic Diagnosis17C. Fluid not getting to the pump See Figure 3.11.• If fluid is not reaching the pump, the log splitter will not work• Continued r

2010 Log Splitters18F. Inspect the tank vent: See Figure 3.13.• The tank vent is drilled through the pipe plug.• As the fluid moves from the tank to t

Hydrualic Diagnosis19H. Engine performance: See Figure 3.15.• The engine should be adjusted to run at 3,500 RPM + 100. Check it with a tachometer.• Th

2010 Log Splitters202. Pump base-line test (ram stationary)A. Perform all of the procedures described in the preparation section of this chapter.B. Wi

Hydrualic Diagnosis21F. Slowly close the needle valve to build 2,000 PSI (220 Bars). See Figure 3.19.G. Record the engine RPMs on the worksheet.H. Rec

2010 Log Splitters224. Control valve testA. Turn off the engine.B. Relieve hydraulic pressure from the system by moving the lever on the control valve

Hydrualic Diagnosis23H. Extend the cylinder fully using the log splitter control valve. • As the ram reaches the end of its travel, pressure will buil

2010 Log Splitters24System drawingsControl valve in Neutral• The pump drives hydraulic fluid to the control valve.• Fluid is shunted directly back to

Hydrualic Diagnosis25Control valve in Extend (splitting)• The pump drives hydraulic fluid to the control valve.• The spool in the control valve direct

IChapter 1: Introduction ...1Professional Service Manual Int

2010 Log Splitters26Control valve in Retract• The pump drives hydraulic fluid to the control valve.• The spool in the control valve directs pressurize

Hydrualic Diagnosis27Relief in Neutral• This drawing shows the relief valve in action with the control valve in neutral.• The relief action is the sam

2010 Log Splitters28For Parts Call 606-678-9623 or 606-561-4983www.mymowerparts.com

Form Number 769-06191 NOTE: This worksheet must be completed and submitted with the failed component for a warranty claim to be paidNOTE: Detailed hyd

3b. Continue closing the needle valve until the pressure gauge reads 2,000 PSI. Record the following: Engine RPM Flow m

Control valve31 MTD uses three different control valves on log splitters. The size of the log splitter determines which valve is used. The thr

2010 Log Splitters326. Disconnect the high pressure hose from the pump.7. Disconnect the high pressure supply hose from the valve using a 15/16” wrenc

Control valve3312. Hold the straight fitting with a 1” wrench. See Figure 4.6.13. Back off the jam nut using a 7/8” wrench.

2010 Log Splitters34To install the valve:19. Transfer the elbows orientation mark to the new valve.20. Check or replace the O-rings on the fittings.21

Control valve35To replace the valve spring cover:NOTE: The spring cover part number is 718-0522.1. Thoroughly clean the valve and surrounding area

IIChapter 8: Maintenance ...61Lubrication . . . . . . . . . . .

2010 Log Splitters36Control valve lever bracketTo replace the lever bracket:NOTE: The lever bracket part number is 718-04765.1. Thoroughly clean the v

CYLINDER37Cylinder removalTo remove/replace the cylinder:1. With the engine turned-off, relieve hydraulic pressure from the system by moving the l

2010 Log Splitters386. Remove the six screws that secure the log dislodger to the beam using a 9/16” wrench. See Figure 5.3.7. Remove the nut and bolt

CYLINDER39Cylinder rebuildingThe cylinder used on the MTD log splitter come from two different suppliers but have the same part number. When replacing

2010 Log Splitters40To rebuild a cylinder: The procedures to rebuild an “E-type” or an “X-type” cylinder are the same.1. Clean the log splitter to pre

CYLINDER419. Wrap a ratchet strap around the wedge and the base plate. See Figure 5.9.10. Hold the control valve in the extend position.NOTE: A bungee

2010 Log Splitters4217. Remove the nut and bolt that attached the wedge to the cylinder ram using a pair of 3/4” wrenches. See Figure 5.12.18. Pl

CYLINDER4322. Clean the paint from the inside edge of the cylinder. See Figure 5.15.NOTE: Paint on the inside edge of the cylinder can catch the back-

2010 Log Splitters4428. Carefully pry the outer piston seal off of the piston. See Figure 5.17.29. Carefully pry the O-ring out of the groove in the p

CYLINDER4537. Install a new back-up ring in the groove, positioned at the edge of the groove that is closer to the side of the rod guide that has the

Introduction1Professional Service Manual Intent This Manual is intended to provide service dealers with an introduction to the mechanical aspects of t

2010 Log Splitters4648. Tighten the screws and washers to lock the rod guide in place. See Figure 5.22.49. Put the cylinder in its normal operating po

Wedge and Beam47WedgeStarting with 2010 production, MTD log splitters have a new beam design. The new beam is made from a heavy gauge U-channel with a

2010 Log Splitters48BeamTo remove/replace the beam:1. With the engine turned-off, relieve hydraulic pressure from the system by moving the lever on th

Wedge and Beam498. Remove the six screws that attach the log dislodger to the beam using a 9/16” wrench. See Figure 6.5.NOTE: The 33 ton models only h

2010 Log Splitters5012. Remove the log trays by removing screws that attach them to the beam using a 1/2” wrench. See Figure 6.8.13

Tank and Tires51TankTo remove/replace the tank:1. With the engine turned-off, relieve hydraulic pressure from the system by moving the lever on th

2010 Log Splitters527. Disconnect the return hose from the oil filter hous-ing. See Figure 7.3.8. Remove the oil filter housing by following the steps

Tank and Tires5314. Remove the wheel assemblies by following the pro-cedures described in the wheel assembly section of this chapter.15. Remove the fe

2010 Log Splitters54Wheel assemblyTo remove/replace the wheel assembly:NOTE: The wheel bearings are covered in Chapter 8: Maintenance.1. Lift and safe

Tank and Tires55FendersThere are a variety of fenders available for MTD log splitters. They can be broken down to two types of fenders; plastic or met

2010 Log Splitters2• Be prepared in case of emergency: Keep a fire extinguisher nearby Keep a first aid kit nearby

2010 Log Splitters56Metal fenderTo remove/replace a metal fender:1. Remove the wheel by following the procedures described in the wheel assembly secti

Tank and Tires57Oil filter housingTo remove/replace the oil filter housing:1. With the engine turned-off, relieve hydraulic pressure from the syst

2010 Log Splitters582. Thread the oil filter housing onto the tank nipple.NOTE: There is an arrow cast into the oil filter hous-ing. The arrow must be

Tank and Tires59Vertical locking rodTo remove the vertical locking rod:1. Pry the push cap off of the vertical locking rod. See Figure 7.17.

2010 Log Splitters60Horizontal locking rodTo remove/replace the horizontal locking rod:1. Move the beam to the vertical splitting position.2. Dive out

Maintenance61LubricationTo help keep the MTD log splitter in proper running order, MTD recommends the following maintenance intervals be used (adjusta

2010 Log Splitters62Engine maintenanceThe recommended maintenance intervals listed in this manual are a guideline. They are adjustable for local con-d

Maintenance63Engine oilCurrently there are four engines available for the MTD log splitter. A generic oil change procedure will be described in this m

2010 Log Splitters64Hydraulic oilThe MTD log splitter has an open vent in the dip stick plug. This leave the hydraulic oil in the reservoir open to co

Maintenance65Wheel bearingsThe wheel bearing on the MTD log splitter will need to be serviced from time to time. The frequency of how often they need

Introduction3Fasteners• Most of the fasteners used on these log splitters are sized in fractional inches. The engine fasteners are metric. For this re

2010 Log Splitters665. Clean and inspect the bearing races.NOTE: If there are signs of wear or damage to a bearing race, it and its matching cone must

For Parts Call 606-678-9623 or 606-561-4983www.mymowerparts.com

MTD Products Inc - Product Training and Education DepartmentFORM NUMBER - 769-0618407/2010For Parts Call 606-678-9623 or 606-561-4983www.mymowerparts.

2010 Log Splitters4Understanding model and serial numbersThe model number of a the compact log splitter described in this manual is 24AA5DMK029. This

Engine and pump5MTD log splitters are available with a variety of horizontal and vertical shaft engines. This manual covers proce-dures that are the s