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7. Fuel and chain oil

RECOMMENDED MIXING RATIO
GASOLINE 50:OIL 1

• Exhaust emission are controlled by the

fundamental engine parameters and
components(eq., carburation, ignition
timing and port timing) without
addition of any major hardware or the
introduction of an inert material during
combustion.

• These engines are certified to operate on

unleaded gasoline.

• Make sure to use gasoline with a

minimum octane number of 89 RON
(USA/Canada: 87AL)

• If you use a gasoline of a lower octane

value than prescribed, there is a danger
that the engine temperature may rise and
an engine problem such as piston seizing
may consequently occur. 

• Unleaded gasoline is recommended to

reduce the contamination of the air for the
sake of your health and the environment.

• Poor quality gasolines or oils may damage

sealing rings, fuel lines or fuel tank of the
engine.

HOW TO MIX FUEL

Pay attention to agitation.

1. Measure out the quantities of gasoline

and oil to be mixed.

2. Put some of the gasoline into a clean,

approved fuel container.

3. Pour in all of the oil and agitate well.
4. Pour In the rest of gasoline and agitate

IMPORTANT

• Gasoline is very flammable. Avoid

smoking or bringing any flame or
sparks near fuel. Make sure to stop the
engine and allow it cool before
refueling the unit. Select outdoor bare
ground for fueling and move at least
3m (10ft) away from the fueling point
before starting the engine. 

• The RedMax engines are lubricated by oil

specially formulated for air-cooled 2-cycle
gasoline engine use. If RedMax oil is not
available, use an anti-oxidant added
quality oil expressly labeled for air-cooled
2-cycle engine use. (JASO FC GRADE
OIL or ISO EGC GRADE)

• Do not use BIA or TCW (2-stroke water-

cooling type) mixed oil.

WARNING

50:1 MIXING CHART

GASOLINE     gal.

1

2

3

4

5

2-CYCLE OIL fl.oz 2.6

5.2

7.8 10.4

13

GASOLINE     liter

1

2

3

4

5

2-CYCLE OIL   ml

20

40

60

80

100

17

Summary of Contents for PSZ2500

Page 1: ...known to the State of California to cause cancer birth defects or other reproductive harm WARNING Before using our machine please read this manual carefully to understand the proper use of your unit W...

Page 2: ...must be followed in order to prevent accidents which could lead to serious bodily injury or death This mark indicates instructions which must be followed or it leads to mechanical failure breakdown or...

Page 3: ...ntrifugal clutch Rigid driveshaft Reduction ratio 0 94 Cutting head Guide bar Type OREGON DOUBLE GUARD 109666 Size 12 300 in mm Saw chain Type OREGON 90SG44X pitch x guage 3 8x0 042 9 53x1 07 in mm Sp...

Page 4: ...oper usage written in the manual WARNING IMPORTANT 1 Lire le mode d emploi avant d utiliser cette machine 2 Porter un casque de s curit des lunettes de s curit et un casque antibruit 3 Lorsque cet l a...

Page 5: ...tion less Position Bottom of the GEAR CASE 4 Symbols on the machine IMPORTANTENGINEINFORMATION ENGINE FAMILY 5KZXS 0254QR EM ENGINE DISPLACEMENT 25cc REFER TO OWNER S MANUAL FOR MAINTE NANCE SPECIFICA...

Page 6: ...wear proper clothing and protective equipment 1 Helmet 2 Ear protectors 3 Protection goggles or face protector 4 Thick work gloves 5 Non slip sole work boots 2 And you should carry with you 1 Attache...

Page 7: ...the product properly and in a safe manner 2 When planning your work schedule allow plenty of time to rest Limit the amount of time over which the product is to be used continuously to somewhere aroun...

Page 8: ...ch as stumps stones cans or broken grass Remove any obstacle before beginning work 4 Inspect the entire unit for loose fasteners and fuel leakage Make sure that the cutting attachment is properly inst...

Page 9: ...weight is distributed evenly across both legs and always be sure to maintain a steady even posture while working 2 Maintain the speed of the engine at the level required to perform cutting work and n...

Page 10: ...eratures immediately after stopping the engine 3 When replacing any part or when replacing the oil or any lubricant always be sure to use only RedMax products or products which have been certified by...

Page 11: ...e nearby before refueling 4 Wipe spilled fuel completely using a dry rag if any fuel spillage occurs during refueling 5 After refueling screw the fuel cap back tightly onto the fuel tank and then carr...

Page 12: ...take several steps to keep your jobs free from accident or injury 1 Understand kickback and pinching You can reduce or eliminate the element of surprise Sudden surprises contributes to accidents 2 Kee...

Page 13: ...r tree to ease the bind and free the blade Do not operate the pole pruner with the muffler removed When cutting a limb that is under tension be alert for springback so that you will not be struck by t...

Page 14: ...onnect the end of the throttle wire to the joint on the top of the carburetor SE2 CONNECTING SWITCH WIRES Connect the switch wires between the engine and the main unit Pair the wires of the same color...

Page 15: ...in cover 2 Mount the guide bar then fit the saw chain around the bar and sprocket SE5 Pay attention to the correct direction of the saw chain 3 Fit the chain tensioner nut into the lower hole of the g...

Page 16: ...Tighten It is very important to maintain the proper chain tension Rapid wear of the guide bar or the chain coming off easily can be caused by improper tension Especially when using a new chain take go...

Page 17: ...of the engine HOW TO MIX FUEL Pay attention to agitation 1 Measure out the quantities of gasoline and oil to be mixed 2 Put some of the gasoline into a clean approved fuel container 3 Pour in all of t...

Page 18: ...amage to the internal engine parts very quickly 2 GASOHOL It can cause deterioration of rubber and or plastic parts and disruption of engine lubrication 3 OIL FOR 4 CYCLE ENGINE USE It can cause spark...

Page 19: ...start position OP4 6 While holding the unit firmly pull out the starter rope quickly until engine fires OP5 1 fuel 2 chain oil 3 choke lever 4 close 5 open 6 ignition switch 7 start 8 stop 9 throttle...

Page 20: ...nk of fuel Be sure to refill the oil tank every time when refueling the saw ADJUSTING OIL FLOW RATE Never fill the oil reservoir nor adjust the oiler with the engine running An increase in bar oil flo...

Page 21: ...mm when measured at the carburetor side end Readjust with the cable adjuster as required OP8 1 cable adjuster ADJUSTING IDLING SPEED OP9 1 When the engine tends stop frequently at idling mode turn the...

Page 22: ...an throttle lever ignition switch check operation gear case grease screws nuts bolts tighten replace not adjusting screws oiling port clean guide bar clean sprocket inspect replace saw chain inspect s...

Page 23: ...h are worn over 0 3mm MA5 1 Sprocket SAW CHAIN It is very important for smooth and safe operation to keep the cutters always sharp Your cutters need to be sharpened when Sawdust becomes powder like Yo...

Page 24: ...nd file it to the proper level as illustrated MA7 Be sure to round off the front edge to reduce the chance of kickback or tie strap breakage 1 Appropriate gauge checker 2 Make the shoulder round 3 Dep...

Page 25: ...d and is cool before performing any service to the machine Contact with moving cutting head or hot muffler may result in a personal injury AIR FILTER The air filter if clogged will reduce the engine p...

Page 26: ...ING TORQUE 9 8 11 8 N m MUFFLER Inspect periodically the muffler for loose fasteners any damage or corrosion If any sign of exhaust leakage is found stop using the machine and have it repaired immedia...

Page 27: ...of use for blockage and remove any waste which has attached itself to the pole saw Note that it is necessary to remove the engine cover shown in MA14 in order to be able to view the upper part of the...

Page 28: ...CTION fuel tank incorrect fuel or staled fuel drain it and with correct fuel carburetor adjustment screw out of normal range adjust to normal range muffler cylinder exhaust port carbon is built up wip...

Page 29: ...n use parts number described in the parts list 4 The contents described in the parts list may change due to improvement 5 The parts for the machine shall be supplied seven 7 years after the machine is...

Page 30: ...12 Parts list 30 Fig 1 DRIVE UNIT PSZ2500 S N 000000 and up Fig 2 CUTTING UNIT PSZ2500 S N 000000 and up...

Page 31: ...A52 6211 1 2 BEARING 06004 06001 1 3 GEAR CASE R COMP T3073 13200 1 4 BEARING 06002 00627 2 5 BOLT 01252 30512 5 6 FITTING 3199 13350 1 7 SCREW tensioner T3073 13310 1 8 NUT tensioner T3073 13320 1 9...

Page 32: ...Fig 3 ENGINE UNIT PSZ2500 S N 50100000 and up 32 12 Parts list...

Page 33: ...500 81120 1 72 NUT adjuster 1751 81180 1 73 SCREW adjuster 1918 81170 1 Key Description Part Number Q ty 74 SCREW 1850 81530 4 75 WASHER 5500 81160 1 76 SCREW 0263 90560 2 77 MUFFLER ASSY 4810 15100 1...

Page 34: ...PART THAT IS EQUIVALENT IN PERFORMANCE AND DULABILITY MAY BE USED IN NON WARRANTY MAINTENANCE OR REPAIRS AND SHALL NOT REDUCE THE WARRANTY OBLIGATION OF THE COMPANY THE COMPANY IS LIABLE FOR DAMAGES T...

Page 35: ...bilit peut tre utilis e pour l entretien hors garantie ou les r parations hors garantie et ce sans r duire l obligation de garantie incombant la soci t La soci t sera tenue responsable des dommages au...

Page 36: ...KOMATSU ZENOAH AMERICA INC 4344 Shackleford Road Suite 500 Norcross Georgia 30093 Printed in Japan...

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