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Makita UC4050A - page 1
1 ENGLISH (Original instructions) INSTRUCTION MANUAL DOUBLE INSULA T ION IMPORT ANT : Read Before Using. Electric Chain Saw UC3050A UC3550A UC4050A UC4550A UC3051A UC3551A UC4051A UC4551A 014371 ...
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Makita UC4050A - page 2
2 ENGLISH (Orig inal instruct ions) SPECIFICA TIONS Model UC3050A UC3051A UC3550A UC3551A UC4050A UC4051A UC4550A UC4551A Max. chain speed 14.5 m/s (880 m/min) Bar length 300 mm 350 mm 400 mm 450 mm Cutting length 260 mm 320 mm 355 mm 415 mm S tandard guide bar Guide bar type S procket nose bar T ype 91PX Pitch 3/8" S tandard saw chain No. of ...
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Makita UC4050A - page 3
3 GEA005-3 General Power T ool Safety W arnings W ARNING Read all safety w arnings and all instructions. Failure to follow the w arnings and instructions may result i n electric shock, fire and /or serious injury . Save all warnings and instructions for future reference. The term "power tool" in the w arnings refers to y our mains-operate ...
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Makita UC4050A - page 4
4 tool’s operation. If dam aged, have the power tool repaired before use. Many accidents are caused by poorly maintained power tools. 23. Keep cutting tools sharp and clean. Properly maintained cutting tools w ith sharp cutting edges are less likely to bind and are ea sier to control. 24. Use the power tool, accessorie s and tool bits etc. in acc ...
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Makita UC4050A - page 5
5 014316 − Do not overreach and do not cut abov e shoulder height. This helps prevent unintended tip co ntact and enables better control of the ch ain saw in unexpected situations. − Only use replacement bars and chains specified by the manufacturer . Incorrect replacement bars and chains may ca use chain breakage an d/or kickback. − Follow t ...
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Makita UC4050A - page 6
6 using the saw in the open air , ensure that the cable employed is intended for open-air use and is rat ed accordi ngly . 3. Keep the cord away from the cutting area and to position cord so that i t will not be caught on branches, and the like, during cuttin g. 4. Do not operate th e chain saw in th e vicinity of flammable dust or gase s, as the m ...
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Makita UC4050A - page 7
7 Safety features 1. Always check that the safe ty features are in working order before st arting work. Do not use the chain saw if the safety features are not working properly . − Chain brake: The chain saw is fitted with a chain brake w hich brings the saw chai n to a standstill w ithin a fraction of a second . It is activated w hen the hand gu ...
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Makita UC4050A - page 8
8 DESIGNA TION OF P ARTS (Nut model: the sprocket co v er is tightened by nuts.) For Model UC3050A, UC3550A , UC4050A, UC4550A 1 2 3 4 5 6 9 10 8 014372 (Lever model: the sprocket cover is tightened by lever .) For Model UC3051A, UC3551A , UC4051A, UC4551A 1 2 3 4 5 6 9 10 8 7 014373 ...
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Makita UC4050A - page 9
9 (For all models) 14 12 11 15 13 17 16 18 014514 Cord hook 1 2 3 4 5 6 7 9 8 10 11 12 13 Spike bumper 18 14 15 16 17 Rear handle Switch trigger Oil filler cap Front handle Front hand guard Guide bar Saw chain Lever Adjusting screw/dial Oil level sight Rear hand guard Lock-off button Chain catcher Guide bar cover Adjusting screw for oil pump (at th ...
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Makita UC4050A - page 10
10 T o remove the saw chain , perform the follow ing steps: 1. Loosen the sprocket cover . 2. (For nut models) T urn the chain adjusting screw counterclockwise to release the saw chain tension. (For lever models) T urn the adjusting dial to "- " direction to loosen the saw chain tension. 1 014515 1 014516 3. Remove the sprocket cover . 4. ...
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Makita UC4050A - page 11
11 Adjusting saw chain tension The saw chain may become loose after many hours of use. From time to time check the saw chain tension before use. 1. Loosen the sprocket cover lightly . 2. Keep lifting up the guide bar tip sligh tly to keep the guide bar hori zontal. 3. Turn the adjusti ng screw / dial to a djust saw c hain tension. 2 -4 mm 1 2 3 5 4 ...
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Makita UC4050A - page 12
12 Reclaimend oil 006921 Lubricate the saw chain and bar using biologicall y degradable saw chain oil with an adhesion agent. The adhesion agent in the saw chain oil prevents the oil from being thrown off the saw excessivel y quickly . Mineral oils must not be used, as they ar e harmful to the environment. CAUTION : • Prevent the oil from coming ...
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Makita UC4050A - page 13
13 Checking the chain brake NOTE: • If the chain saw fails to star t, check whether the chain brake is r eleased. T o release the chain brake, pull the hand guard backw ards firmly until you feel it engage. 1 2 3 014387 1 3 2 014439 Check the chain brake as follow s : 1. Hold the chain saw with both ha nds when switching it on. Hold the rear hand ...
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Makita UC4050A - page 14
14 Bucking 1 014389 For bucking cuts, rest the spike bum per shown in the figure on the w ood to be cut. With the saw cha in running, saw into the wood, using the rear handle to raise the saw and the front one to guide it. Use the spike bumper as a pivot. Continue the cu t by applying slight pre ssure to the front handle, easing the saw back s ligh ...
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Makita UC4050A - page 15
15 (3) Th e base of t he trunk is free of forei gn objects, ro ots and ranche s; (4) No persons or object s are present over a distance of 2 1/2 tree lengths in th e direction in which the tree will fall. − Consider th e following with re spect to e ach tree: • Direction of lean; • Loose or dry branches; • Height of the tree; • Natural ov ...
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Makita UC4050A - page 16
16 Sharpening the saw chain CAUTION : • Always withdraw the mains plug and wear safety gloves when perform ing work on the saw chain. 006924 Sharpen the saw chain when: − Mealy sawdust is produced w hen damp wood i s cut; − The chain penetrates the wood w ith diffi culty , even when heavy pressu re is applied; − The cutting edge is obviousl ...
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Makita UC4050A - page 17
17 30 006928 − After sharpening the chain, check the height of the depth gauge using the chain gauge tool (op tional accessory). 014344 − Remove any projecting material , however small, with a special flat file (optional accessory ). − Round off the front of the depth gauge again. Cleaning the guide bar a nd lubricating the return sprocket CA ...
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Makita UC4050A - page 18
18 Replacing carbon br ushes 1 001 1 45 Remove and check the carbo n brushes regularly . Replace when they w ear down to the limit mark. Keep the carbon brushes clean and free to slip in the holders. Both carbon brush es should be replaced at the same time. Use only identica l carbon brushe s. 1 2 014395 Use a screwdriver to remov e the brush holde ...
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Makita UC4050A - page 19
19 TROUBLE SHOOTING Before asking for rep airs, conduct y our own inspection first. If you find a problem that is no t explained in the manual, do not attempt to dismantle the tool. Instead, ask Makita Authorized Service Cen ters. No oil on the chain. Chain does not stop even the chain brake is engaged. The tool vibrates abnormally . Malfunction st ...
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Makita UC4050A - page 20
20 Makita Corporation www.makita.com 885287-3 ...
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