For one year from the date of original retail purchase, MTD PRODUCTS INC will either
repair or replace, at its option, free of charge, F.O.B. factory or authorized service firm, any
part or parts found to be defective in naterial or workmanship. Transportation charges for
the movement of any power equipment unit or attachment are the responsibility of the pur
chaser. Transportation charges for an/ parts submitted for replacement under this warran
ty must be paid by the purchaser unless such return is requested by MTD PRODUCTS INC.
This warranty will not apply to any p£ rt which has become inoperative due to misuse, ex
cessive use, accident, neglect, improper maintenance, alterations, or unless the unit has
been operated and maintained in accordance with the instructions furnished. This warran
ty does not apply to the engine, motor, battery, battery chargeror component parts thereof.
Please refer to the applicable manufacturer’s warranty on these items.
This warranty will not apply where the unit has been used commercially.
Warranty service is available through your local authorized service dealer or distributor. If
you do not know the dealer or distributor in your area, please write to the Customer Service
Department of MTD.
The return of a complete unit will not be accepted by the factory unless prior written per
mission has been extended by MTD.
♦
♦
This warranty gives you specific iegi:
from state to state.
rights. You may also have other rights which vary
V
I WARNING {
TC PURCHASERS
OF INTERNAL COMBUSTION ENGINE EQUIPPED
MACHINERY OR DEVICES IN THE STATE OF CALIFORNIA
The equipment which you have just purchaser does not have a spark arrester, if this equipment is used on
any forest covered land, brush covered land, c r grass covered unimproved land in the State of California,
before using on such land, the California law requires that a spark arrester be provided. In addition, spark
arrester is required by law to be in effectivî working order. The spark arrester must be attached to the
exhaust system and comply with Section 4442 of the California Public Resources Code.
IMPORTANT
It is suggested that this manual be read in its entirety before attempting to assemble or operate. Keep this manual
^ in a safe place for future reference and for ordering replacement parts.
This unit is shipped WITHOUT GASOLINE or 01L. After assembly, see separate engine manual for proper fuel and
engine oil recommendations.
Your log splitter is a precision piece of power equipment, not a plaything. Therefore exercise extreme caution at
all times.
SAFE OPERATION PRACTICES FOR LOG SPLITTERS
TRAINING
1. Know the controls and how to stop quickly-READ THIS OWNER'S MANUAL.
2. Do not allow children to operate. Do not allow
adults to operate it without proper instruction.
Only persons well acquainted with these rules of
safe operation should be allowed to use your log
splitter.
3. Never use your splitter for any other purpose
than splitting wood. It is designed for this use
only and any other use may cause an injury.
4. Only the operator is to be near your log splitter
during use. Keep all others, including pets, a
minimum of 20 feet away from your work zone.
Flying wood can be hazardous.
*^5. Don't step over your splitter when engine is
running. You may trip or accidentally activate
ram if you step over. If you need to get to the
other side, walk around.
PREPARATION
1. Do not wear loose fitting clothing that could get
caught on the moving parts.
Do not operate equipment when barefoot or
2.
wearing open sandals. Always wear safety shoes or
heavy boots. A dropped log can seriously injure
your foot.
Check the fuel before starting the engine. Do not
3.
fill the gasoline tank indoors, when the engine is
running, or while the engine is still hot. Wipe off
any spilled gasoline before starting the engine.
Use only in daylight or in good artificial light.
4.
Never operate your splitter on slippery, wet,
5.
muddy, or icy surfaces. Safe footing is essential in
preventing accidents. Never operate your splitter
while attached to a towing vehicle.
Always wear safety glasses or goggles while oper
6.
ating your log splitter. A piece of splitting log
could fly off and hit your eyes.
Both ends of each log must be cut square. This
7.
will prevent the log from flying out of thesplitter
while under pressure.
OPERATION
1. Do not change the engine governor settings or
overspeed the engine. Excessive engine speeds are
dangerous.
2. Never place hands or feet between log and split
ting wedge or between log and ram during forward
or reverse stroke. To do so may result in crushed
or amputated fingers or toes, or worse, you may
lose an arm or foot.
3. If the equipment should start to vibrate abnor
mally, stop the engine and check immediately for
the cause. Vibration is generally a warning of
trouble.
4. When cleaning, repairing or inspecting, make
certain ail moving parts have stopped. Disconnect
the spark plug wire, and keep the wire away from
the plug to prevent accidental starting.
5. Handle gasoline with care. It is highly flammable.
A. Use approved gasoline container.
B. Never remove cap or add gasoline to a running
or hot engine or fill fuel tank indoors. Wipe
up spilled gasoline.
C. Don't run engine in an enclosed area. Ex
haust gases contain carbon monoxide. This
odorless gas can be deadly when inhaled.
6. Stand behind the ram when operating. See draw
ings.
7. Be careful not to touch the muffler after the
engine has been running. It is HOT.
8. Never try to split two logs on top of each other.
One may fly out and injure you.
9. Never attempt to split wood across the grain.
Some types of wood may burst or fly oit of
your splitter and result in injury to you or a
bystander.
10. Never leave your log splitter unattended wit ithe
engine running. Shut off the engine if you are
leaving your splitter, even for a short period of
of time. Someone could accidentally activate the
ram and be injured.
11. Only use your hand to operate the ram or co itrol
lever. Never use your foot or a rope or any other
extension device. This could result in your ir abil
ity to stop your splitter quickly enough and
cause an injury.
12. Only operate your splitter on the level ground and
not on the side of a hill. It could tip, or rolling
logs or poor footing could cause an accicent.
This also prevents the spillage of gas from the
tank.
MAINTENANCE and STORAGE
1. Don't operate your splitter in poor mechiinical
condition or when in need of repair.
2. Keep all nuts, bolts, screws, hose clamp;; and
hydraulic fittings tight to be sure equipment is
in safe working condition.
3. Replace all damaged or worn parts such cS hy
draulic hoses and fittings immediately with man
ufacturer approved replacement parts.
4.
Never store the equipment with gasoline in the
tank inside of a building where fumes may reach
an open flame or spark. Allow the engine to cool
before storing in any enclosure.
To reduce fire hazard keep engine free of grass,
5.
leaves, wood chips, excessive grease and oil.
The hydraulic system of your log splitter re
6.
quires the careful inspection along with the
mechanical parts. Be sure to replace frayed,
kinked, cracked or otherwise damaged hydraulic
components.
Fluid escaping from a very small hole can almost
be invisible. Do not check for leaks with your
hand. Escaping fluid under pressure can have
sufficient force to penetrate skin, causing serious
personal injury. Leaks can be located by passing
a piece of cardboard or wood over the suspected
leak and look for discoloration.
Should it become necessary to loosen or remove
8.
any hydraulic fitting or line, be sure to relieve
all pressure by shutting off the engine and moving
the control handle back and forth several times.
Don't remove the cap from the hydraulic tank or
9.
reservoir while your log splitter is running. Hot
oil under pressure could cause injury.
10. Never store outside without a waterproof cover.
Rain will cause rust on the inside of the cylinder.,
CAUTION
THIS UNIT SHOULD NOT BE TOWED ON ANY
STREET, HIGHWAY OR PUBLIC ROAD. ANY
LICENSING NI:EDED TO COMPLY WITH THE
EXISTING FEDERAL, LOCAL OR STATE VEH
ICLE REQUIRI MENTS IS THE SOLE RESPONSI
BILITY OF the; purchaser.
>N, A-
FIGURE 1.
\
G
TOOLS REQUIRED
(1) Raw Hide or Plastic Hammer
(1) 3/4" Wrench or Adjustable Wrench
(1) Pipe Wrench
(1) Pair of Pliers
OTHERS MATERIALS NEEDED
One gallon of regular grade gasoline (for engine).
1-1/2 pints of SAE 30 or 10W30 oil (for engine)
Approximately 2 gallons of Dexron II automatic
transmission fluid (may be obtained at any local
service station or auto parts store)
Funnel
Pipe sealant
CONTENTS OF HARDWARE PACK (See figure 1):
A (1) Shoulder Bolt
B (1) Wave Washer
C (1) Ferrule
D (1) Hairpin Cotter
E (2) Flat Washers
F (1) Cotter Pin
G (2) Axle Push Caps
H (1) Spacer
ASSEMBLY INSTRUCTIONS
1
FIGURE 2.
M
■LOOSE PARTS IN CARTON (See figure 2):
J (2) Wheels
K (1) Axle Shaft
L (1) Engagement Rod
M (1) Engagement Handle
Hook the bent end of the engagement rod (L)
into the lever on top of the pump. See figure 3.
Next, place flat washer (E) over the rod. Insert
the cotter pin (F) into the hole in the rod and
secure by bending the ends of the cotter pin in
opposite directions.
FIGURE 3.
SHOULDER BOLT (A)
FIGURE 4.
— ENGAGEMENT HANDLE IM)
Place the flattened end of the engagement handle
(M) down through the slotted bracket beside the
beam. Secure the bottom hole in the handle to
the beam with shoulder bolt (A) and wave washer
(B) as shown in figure 4.
WAVE WASHER (B)
HAIR PIN COTTER (D)
FIGURE 5.
HAMMER
AXLE PUSH CAP (G)
Place the engagement handle in the notch in the
slotted bracket. See figure 5. Thread the ferrule
(C) onto the engagement rod until the ferrule
lines up with the hole on engagement handle.
Secure the ferrule (C) to engagement handle
with flat washer (E) and hairpin cotter (D).
See figure 5.
Using a raw hide or plastic hammer, tap one axle
push cap (G) on one end of axle shaft (K). See
figure 6.
AXLE
SHAFT (K)
FIGURE 6.
AXLE PUSH CAP
(G)
FIGURE?.
LEFT .
HAND SIDE
OF
SPLITTER ' j ,
4
SPACER(H)
7. Slide one wheel onto the axle shaft, then the
spacer (H). See figure 7.
WHEEL
8. Slide the axle through the frame from the left
hand side of the splitter (as viewed from standing
behind it). Spacer should be on the engine side
of the splitter. See figure 8.
FIGURES.
N
AXLE PUSH CAP (H)
FIGURES.
9. Place the other wheel on the axle and secure with
push cap (H). See figure 9.
OPERATION
BEFORE STARTING
NOTE
Refer to engine manual packed with
log splitter for complete instructions
for the care and maintenance of en
gine. READ DIRECTIONS CARE
FULLY.
1.
Fill sump with oil as instructed in the sepa ate
engine manual. Drain and fill the engine from
the same opening. See figure 10.
TO START ENGINE
1. Place throttle control lever (on engine) in RUN
position, towards the front of splitter. See figure
12.
THRO
FIGURE 12.
FIGURE 10.
2.
Fill fuel tank, using clean, fresh, regular g ade
automotive gasoline. Fill tank completely.
Fill reservoir tank on log splitter. Remove the
3.
breather plug from breather tube. See fijure
11. Pour approximately 2 gallons of De);ron
automatic transmission fluid ONLY into brea:her
tube.
A
DO NOT operate log splitter without
proper amount of oil in reservior tank
beam.
CAUTION
me
Open the breather valve. Valve must be open
2.
when running log splitter. Valve must be closed
when transporting log splitter. See figure 13.
Grasp starter handle, place one foot on wheel and
3.
pull starter handle with a quick, full arm stroke.
Return rope slowly to the engine.
VALVE IN CLOSED
POSITION
VALVE IN OPEN
POSITION
t
BREATHER PLUG AND VALVE
NOTE: Valve has left hand threads.
Turn clockwise to close.
FIGURE 11.
FIGURE 13.
TO STOP ENGINE
1. Move throttle control lever to STOP position.
2. Remove high tension wire from spark plug to
prevent accidental starting by children while
equipment is unattended.
USING YOUR LOG SPLITTER
CAUTION
A
This unit should not be towed on any
street, highway or public road. Any
licensing needed to comply with the
existing federal, local or state vehicle
requirements is the sole responsibility
of the purchaser.
Your log splitter is designed for safe, effecient
operation. CARE, OF COURSE, MUST BE EXER
CISED THAT HANDS AND FEET ARE KEPT
AWAY FROM MOVING PARTS.
Engagement handle has three positions: (See figure 14)
The ram should take approximately 22 seconds to
make a complete cycle. This speed may vary de
pending on throttle setting and temperature of oil.
NOTE
If you lock the engagement handle in the reverse slot,
the ram will return until it hits the return stroke stop
plunger, which will throw the engagement handle
into neutral automatically.
t WARNING j
Never attempt to cut a log in half
with the log splitter.
Never stand next to the ram when
operating. Always stand behind the
ram.
ENGAGEMENT HANDLE
IN NEUTRAL POSITION.
ENGAGEMENT HANDLE
HELD IN FORWARD
POSITION.
•n
ENGAGEMENT HANDLE
LOCKED IN REVERSE
POSITION.
STROKE RETURN STOP
PLUNGER.
FIGURE 14
Maximum length that can be split is 20".
1.
Set throttle at maximum speed.
Place log on beam and hold in place with right
2.
hand.
Slowly move engagement handle forward until
3.
ram rests against log. Release engagement handle
(Neutral).
'4.
Remove your hand from the log and step behind
the ram.
5.
Move engagement handle forward until log is split.
Move the engagement handle to the rear to return
6.
ram.
1
MAINTENANCE
\ WARNING {
Always stop engine and disconnect
spark plug wire before performing any
maintenance or adjustments.
ENGINE OIL
Change oil first two (2) hours of operation and check
oil level every five (5) operating hours or each time
equipment is used.
Change oil every twenty-five (25) operating hours or
sooner if equipment is operated in extremely dusty
or dirty conditions.
Refer to engine manual for quantity and type of oil.
LOG SPLITTER RESERVOIR OIL
Check oil in log splitter reservoir before every use.
See figure 15.
1. Block up front of log splitter so beam is level.
2. Remove check pipe plug in rear of beam. See
figure 5. If oil starts to come out of check pipe
plug hole, oil level is correct. IF IT DOES NOT,
add oil to breather tube (see figure 11) until oil
starts out.
NOTE
Use hydraulic sealant tape or pipe
sealant on pipe plug threads.
3. Replace check pipe plug. Remove block from
under front of beam.
OIL CHECK PIPE PLUG
STRAINER TUBE ASSEMBLY
If the ram does not move back and forth smoothly,
the strainer tube assembly may be clogged.
To clean, follow instructions for changing the reservoir
oil, step number 1 through 3. Clean the strainer tube
assembly and reassemble using a hydraulic pipe sealant
on the threads.
HOSE CLAMPS
Check the hose clamps on the bottom of the pump
for proper tightness before each use.
Hose clamps on the return hose should be checked
once a season.
STROKE RETURN STOP PLUNGER
If the engagement handle does not return to neutral
(from reverse) before the pressure relief bypass opens,
loosen the hex lock nut, and back out the hex bolt
one or two turns. See figure 17.
FIGURE 15
Change oil in the reservoir every (100) hou s of
operation.
1. Remove the hose clamp at inlet hose (bottom
hose on rear of beam). See figure 16.
NOTE
Be prepared to catch oil in a suitable
container.
2. Pull off inlet hose from strainer tube assembly^ and
catch oil in a suitable container. See figure 1£.
3. With an adjustable wrench remove the strainer
tube assembly. See figure 16.
NOTE
The strainer tube assembly is 42" long.
4. Drain oil, clean strainer tube and reassemble
using a hydraulic pipe sealant on the threads.
5. Remove the breather plug from breather :ube.
See figure 7. Pour approximately 2 galloris of
Dextron II transmission fluid ONLY into breither
tube.
NOTE
When the pressure relief valve opens,
a loud high pitohed sound is heard and
engine labors.
Tighten hex lock nut and operate log splitter. Repeat
if necessary.
HEX BOLT
/if I
STROKE RETURN
STOP PLUNGER
FIGURE 17
RAM OPERATION
If the ram does not move smoothly, run the ram its
full stroke several times to clear out air in the system.
Be sure the breather valve is open.
If this does not correct the problem, see Strainer Tube
Assembly paragraph.
HEX NUT
CARBURETOR ADJUSTMENTS
I WARNING {
If any adjustments are made to the
engine while the engine is running
(e.g. carburetor), keep clear of all
moving parts. Be careful of heated
surfaces and muffler.
Refer to engine manual packed with your unit for
carburetor adjustment information.
10
BELT REPLACEMENT
1. Disconnect the spark plug wire from the spark
plug and ground against the engine block.
''-2. Drain the gasoline from the fuel tank or place a
piece of plastic under the cap to prevent leakage.
3. Tip the splitter on one side.
4. Remove four self-tapping screws from the bottom
belt cover and frame. See figure 18.
8. Slide the engine outward to tighten the new belt
until there is approximately 1/2.'/-. deflection.
Tighten engine mounting bolts securely.
FIGURE 20
FIGURE 18
^5. Using a 9/16" wrench, remove the engine pulley
by removing the hex bolt and lock washer. See
figure 19. Slip the pulley and belt off.
NOTE
Be careful not to lose the square key
on the crankshaft.
OFF-SEASON STORAGE
In event engine is to be stored for any length of time
(30 days or more), prepare as follows:
1. Drain gasoline by tipping or by siphon hose, then
run engine until remainder is used and tank and
carburetor are empty.
A
Drain gasoline into container outdoors
from fire or flame.
2.
Drain carburetor by running engine until it stops
from lack of fuel.
3.
Protect the inside of engine for storage by
removing spark plug and pouring one ounce of
SAE 30 oil through spark plug hole into cylinder.
Crank engine, without starting, several times to
spread oil over cylinder walls.
4.
Never store outside without a waterproof cover.
CAUTION
»kFIGURE 19
6.
Loosen the three engine mounting bolts using a
1/2" wrench. See figure 20.
7. Install the new belt.
11
A
When storing any type of power equip
ment in an unventilated or metal
storage shed, care should be taken to
rust proof the equipment. Using a
light oil or silicone, coat the equip
ment, especially springs and bearings.
CAUTION
TROUBLE SHOOTING CHART
SYMPTOM
1. Engine fails to start
2. Hard starting or loss of
power.
3. Engine overheats
4 Will not split logs
POSSIBLE CAUSE(S)
A. Check iuel tank for gas.
B. Spark plug lead wire
disconnected.
C. Faulty ipark plug.
A. Spark p lug wire loose.
B. Dirty a r cleaner.
A. Carbun tor not adjusted
prope riy.
B. Airflov/ restricted.
C. Engine oil level low.
A. Relief valve setting
incor ect.
B. Pump setting incorrect.
SOLUTION
A. Fill tank if empty.
B. Connect lead wire.
C. Spark should jump gap between
control electrode and side electrode.
If spark does not jump, replace the
spark plug.
A. Connect and tighten spark plug wire.
B. Clean air cleaner as described in
engine manual.
A. Adjust carburetor. See engine manual.
B. Remove blower housing and clean as
described in the engine manual.
C. Fill crankcase with the proper oil.
A. Shim valve with .010 flat washer.
B. Adjust pump setting.
5. Leaking cylinder
NOTE: For repairs beyond the minor adjustments isted above,please contact your local service dealer.
A. Broken seals.
B. Scored cylinder.
A. Replace seals.
B. Replace cylinder.
12
Model 638
STAMPED PART NUMBER AND DATE CODE
No Letters - HEiL - Will Require Cylinder “0"-Ring Kit 753-0369
Cylinder Ass'y- Comp.
2-1/2" Cyl. Kit "0"-Ring Set
(Agri-Fab)
(Heil)
13
Model 638
NOTE
This instruction manual covers various models, and
all specifications shown do not necessarily apply to
your model. Specifications subject to change without
notice or obligation.
747-0458Axle Shaft 5/8" Dia. x
749-0625Engagement Lever .88''
44
750-0118Spacer 5/8" I.D. x 7/8"
45
N50
781-0001
747-0457
52781-0008
N
15234
53
DESCRIPTION
L.-Wash. 5/16" I.D.*
Fl.-Wash. .341" |.D. x
.88" O.D.
Female Adapter 1/4
NPTFN
Breather Valve 1/4
NPTF-M
Adapter 3/4 Tubing to
9/16-18 to 7/16-20
O.R. M-Boss
Tube 1/2 NPTF
90° Elbow - 1/2 NPTF
.170" Lg.
Return Stroke Stop
Plunger
X 25.25" Lg.N
O.D. x17"Lg. -N
O.D. x.90"Lg.
(4L) Belt 1/2" V X 30" Lg. N
X 3-1/4" O.D.
1/2" V-Pulley 7/8" I.D. x
3-1/4" O.D.
Oil Tank & Frame Ass'y.
Comp.N
Engagement Rod 5/16-2^
Thd.
Belt Cover
Strainer Tube Ass'y.
Cotter Pin 3/32" Dia. x
.75" Lg.*
NEW
PART
N
N
N
N
N
N
N
N
N
‘For faster service obtain standard nuts, bolts and washers locally. If these items cannot be obtained locally, order ly part-
number and size as shown on parts list.
The engine is not under warranty by the log splitter manufacturer. If repairs or service is needed on the
engine, please Contact your nearest authorized engine service outlet. Check the "Yellow Pages" of your
telephone book under "Engines - Gasoline.”
Find It Fast
In The
Yellow Pages
15
PARTS INFORMATION
POWER EQUIPMENT PARTS AND SERVICE
Parts and service are available through the authorized ser vice
firms listed below. All orders should specify the model number of
your unit, part numbers, description of parts and the quantlly of
each part required.
NOTE: If any parts are found to be missing or defective upon assembly of this unit, write to advise the factory so
that immediate replacement can be made.
ALABAMA BIRMINGHAM
Auto Electric & Carburetor Co. ... 2625 4th Ave. S
BRIGGS AND STRATTON, TECUMSEH AND PEERLESS PARTS
AND SERVICE
Briggs & Stratton, Tecumseh and Peerless parts and service
should be handled by your nearest authorized engine service firm.
Check the yellow pages of your telephone directory under the
listing Engines—Gasoline, Briggs & Stratton or Tecumseh
Lauson.
American Sales & Service, Inc. ... 3035-43 Bellbrook ....38116
TEXAS DALLAS
Marr Brothers, Inc
..........................
423 E. Jefferson
FORT WORTH
Woodson Sales Corp..................... 1702 N. Sylvania
HOUSTON
Bullard Supply Co.......................... 2409 Commerce St. ...77003
SAN ANTONIO
Engine House Inc
..........................
8610 Botts Lane
P.O. Box 17867
UTAH SALT LAKE CITY
A-1 Engine & Mower Co
................
439 E. 900 So
............
VIRGINIA ASHLAND
RBI Corp........................................'101 Cedar Run Dr
WASHINGTON SEATTLE
Bailey’s Inc
....................................
1414 14th Ave
.............
WISCONSIN APPLETON
Automotive Supply Co
...................
123 S. Linwood Ave.
P.O. Box 798
..............
CHILTON
Horst. Dist...................................... 444 N. Madison
........
.........
........
.....
.....
.........
........
..........
......
..........
27530
27402
44102
44281
44501
74401
17110
19120
15767
37921
75203
76111
78217
84111
23005
98122
54911
53014
WARRANTY
The purpose of warranty is to protect the customer from
time of manufacture. It does not provide for the unlimite
sibility of the customer. The manufacturer cannot assun
the manufacturer’s fault, it’s the manufacturer’s responsi
CLAIMS AGAINST THE MANUFACTURER’S WARRANTY
INCLUDES:
1. Replacement of Missing Parts on new equipment.
2. Replacement of Defective Parts within the warranty p eriod.
3. Repairof Defects within the warranty period.
MTD PRODUCTS INC
P.O. BOX 36900
PARTS AND SERVICE POLICY (0483)
defects in workmanship and materials, defects which are NOT detected at the
J and unrestricted replacement of parts. Use and maintenance are the responle responsibility for conditions over which it has no control. Simply put, if it’s
bility; if it’s the customer’s fault, it’s the customers’s responsibility.
All claims MUST be substantiated with the following
information;
1. Modei Number of unit involved.
2. Date unit was purchased or first put into service.
3. Date of failure.
4. Nature of failure.
CLEVELAND, OHIO 44136
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