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MTD
Log Splitter

Model # 638 Official MTD log splitter

Here are the diagrams and repair parts for Official MTD 638 log splitter, as well as links to manuals and error code tables, if available.

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Model diagram and schematic

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ALL PARTS
Showing 10 of 66 parts  |
Lawn & Garden Equipment Hex Head Screw 710-0895

#106

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Lawn & garden equipment hex head screw

Part #710-0895

$8.20 | 
11% OFF Phone Price : $9.20
In Stock
Unknown Brand Name #689 Lawn Tractor Cotter Pin (replaces 01002627, 714-04039a) 714-0162

#2

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Unknown brand name #689 lawn tractor cotter pin (replaces 01002627, 714-04039a)

Part #714-0162

$7.57 | 
12% OFF Phone Price : $8.57
In Stock
Unknown Brand Name #689 Lawn Tractor Flat Washer 736-0262

#104

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Unknown brand name #689 lawn tractor flat washer

Part #736-0262

This item is not returnable
$5.11 | 
16% OFF Phone Price : $6.11
In Stock
Sears Snowblower Flat Washer (replaces 936-0159) 736-0159

#90

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Sears snowblower flat washer (replaces 936-0159)

Part #736-0159

This item is not returnable
$5.73 | 
15% OFF Phone Price : $6.73
In Stock
Yard Machines Lawn Tractor Hex Bolt 710-0521

#39

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Yard machines lawn tractor hex bolt

Part #710-0521

This item is not returnable
$8.97
In Stock
Unknown Brand Name #689 Log Splitter Hub Cap 734-0873

#3

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Unknown brand name #689 log splitter hub cap

Part #734-0873

This item is not returnable
$20.51
In Stock
Unknown Brand Name #689 Log Splitter Pressure Tube Pipe Nipple, 1/2-in 737-0238

#9

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Unknown brand name #689 log splitter pressure tube pipe nipple, 1/2-in

Part #737-0238

This item is not returnable
$33.43 | 
15% OFF Phone Price : $39.43
In Stock
Flat Washer 736-0351

#5

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Flat washer

Part #736-0351

This item is not returnable
$6.23
In Stock
Unknown Brand Name #689 Log Splitter Hose Clamp 726-0132

#81

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Unknown brand name #689 log splitter hose clamp

Part #726-0132

$26.71
In Stock
Plate 781-0537

#24

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Plate

Part #781-0537

$48.18
In Stock

Most common symptoms to help you fix your log splitters

Choose a symptom to see related log splitter repairs.

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Why does my log splitter's hydraulic cylinder leak?

Main cause: worn hydraulic cylinder seals…

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Why does my log splitter's hydraulic valve leak?

Main cause: worn hydraulic valve seals around the actuator rod…

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Why won't my log splitter's hydraulic cylinder extend the wedge?

Main causes: broken pump coupler, clogged hydraulic fluid filter, bad hydraulic control valve, broken hydraulic pump, ba…

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Why does my log splitter's engine leaks oil or gas?

Main causes: leaky head gasket, damaged sump gasket, leaky oil drain plug, damaged fuel line, bad carburetor seals…

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Why does my log splitter's hydraulic pump leak?

Main cause: worn hydraulic pump seals…

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Why does my log splitter's engine run rough or misfire?

Main causes: dirty carburetor, bad spark plug, clogged air filter, stale fuel…

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Why won't my log splitter's engine start?

Main causes: dirty carburetor, stale fuel, bad spark plug, broken recoil starter…

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Most common repair guides to help fix your log splitters

These step-by-step repair guides will help you safely fix what’s broken on your log splitter.

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How to replace a log splitter flexible pump coupler

How to replace a log splitter flexible pump coupler

The flexible nylon log splitter pump coupler deteriorates over time. Replace the flexible pump coupler if it begins to v…

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Repair difficulty
Time required
 15 minutes or less
How to replace a log splitter recoil starter

How to replace a log splitter recoil starter

The recoil starter spins the engine on the log splitter when you pull the starter rope, and the rope retracts when relea…

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Repair difficulty
Time required
 15 minutes or less
How to replace a log splitter carburetor

How to replace a log splitter carburetor

The carburetor mixes air and gas before the fuel mix goes to the engine. If the engine won't start and the spark plug is…

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Repair difficulty
Time required
 30 minutes or less

Effective articles & videos to help repair your log splitters

Use the advice and tips in these articles to get the most out of your log splitter.

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Find the right carburetor assembly for a Craftsman snowblower, tiller or log splitter

Find the right carburetor assembly for a Craftsman snowblower, tiller or log splitter

This chart will help you find the right carburetor for your Craftsman snowblower, tiller or log splitter.…

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How to maintain the hydraulic system in a log splitter

How to maintain the hydraulic system in a log splitter

See how to properly maintain the hydraulic system in your log splitter.…

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How to change the hydraulic fluid in a log splitter

How to change the hydraulic fluid in a log splitter

Learn how to change the hydraulic fluid in your log splitter.…

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