Rato RT50ZB26-3.6Q User manual

RT50ZB26-3.6Q/ RT80ZB26-3.6Q/
RT100ZB26-5.2Q
WATER PUMP SERVICE MANUAL

CHONGQING RATO POWER CO., LTD
This manual contains information how to routine maintain and how to do troubleshooting.
Keep this owner’s manual handy, so you can refer to it at any time.
This service manual describes correct method of the maintaining this equipment. As a result of this disregard
for our rules caused by person casualty and equipment damaged, our company does not assume any
responsibility.
NOTICE:
Copyright reserved, and no part of this publication may be reproduced without RATO Company’s written
permission.
SAFETY MESSAGES
Your safety and the safety of others are very important. We have provided important safety messages in this
manual and on the generator. Please read these messages carefully.
A safety message alerts you to potential hazards that could hurt you or others. Each safety message is
preceded by a safety alert symbol and one of three words: DANGER, WARNING, or CAUTION.
These mean:
You WILL be KILLED or SERIOUSLY HURT if you don’t follow instructions.
You CAN be KILLED or SERIOUSLY HURT if you don’t follow instructions.
You CAN be HURT if you don’t follow instructions.
Your generator or other property could be damaged if you don’t follow
instructions.

CONTENT
1. PREFACE ............................................................................................................................................... 1
1-1 Component identification ......................................................................................................... 1
1-2 Specifications ........................................................................................................................... 2
2. DIMENSION AND TORQUE ............................................................................................................... 4
2-1 Engine dimension ..................................................................................................................... 4
2-2 Water pump dimension ............................................................................................................. 7
2-3 Torque value ........................................................................................................................... 10
3. MAINTENANCE ..................................................................................................................................... 12
3-1 Maintenance schedule ............................................................................................................ 12
3-2 Engine oil ............................................................................................................................... 12
3-3 Air cleaner .............................................................................................................................. 13
3-4 Fuel oil cup cleaning .............................................................................................................. 14
3-5 spark plug cleaning and .......................................................................................................... 14
3-6 Valve clearance adjustment .................................................................................................... 14
3-7 Governor ................................................................................................................................. 15
4. DISASSEMBLING AND SERVICING .................................................................................................. 16
4-1 Troubleshooting ...................................................................................................................... 16
4-1-1 Starting Difficult ......................................................................................................... 16
4-1-2 Power lack ................................................................................................................... 19
4-1-3 Speed unstable ............................................................................................................. 20
4-1-4 WAT ER P UMP UN AB LE D IS CH ARG E ................................................................... 20
4-1-5 Exhaust gas color abnormal ........................................................................................ 21
4-1-6 Unable igniting ............................................................................................................ 21
4-1-7 Oil alert system malfunction ....................................................................................... 22
4-1-8 GASOLINE ENGINE IS OVERERHEAT ................................................................. 22
4-2 Preparation of servicing .......................................................................................................... 23
4-2-1 Safety precautions ....................................................................................................... 23
4-3 Dismounting chart .................................................................................................................. 29
4-4 Gasoline engine ...................................................................................................................... 30
4-4-1 Recoil starter ............................................................................................................... 31
4-4-2 Flywheel ...................................................................................................................... 33
4-4-3 Air cleaner ................................................................................................................... 35
4-4-4 Carburetor ................................................................................................................... 37
4-4-5 Cylinder head /valve ................................................................................................... 40
4-4-6 Crankshaft/piston ........................................................................................................ 45
4-5 Water pump ............................................................................................................................. 53
4-5-1 Pump body .................................................................................................................. 53
4-5-2 Frame .......................................................................................................................... 55

1. PREFACE
1
1. PREFACE)
1-1 Component identification
CHOKE LEVER
FUEL COCK
ENGINE SWITCH
DISCHARGE PORT
FUEL TANK CAP
OIL DIPSTICK
RECOIL
STARTER
GRIP
PUMP DRAIN PLUG
SUCTION PORT
PRIMING WATER
FILTER CAP
OIL DRAIN PLUG
MUFFERLER
AIR CLEANER
FRAME

1. PREFACE
2
1-2 Specifications
Engine specification
Model
Items
R200
R270
L×W×H
390×320×345mm
355×430×410mm
Dry Weight
16Kg
26 kg
Engine Type
4-stroke, OHV, single cylinder
Displacement
196cm3
270cm3
Compression Ratio
8.5 ：1
8.2 ：1
Bore×Stroke
68×54mm
77×58mm
Maximum output Power
4.0kW /3,600rpm
5.8kW/3,600rpm
Maximum Torque
11N·m /2,500rpm
17N·m /2,500rpm
Cooling System
Forced Air-cooled
Ignition System
Transistorized Magneto Ignition（TCI）
Spark Plug
BPR6ES(NGK)，NHSP LD F7RTC，F7TC
Lubrication System
Forced Splash
PTO Shaft Rotation
counterclockwise