Viking MB 650 User Manual (English)

Questions and Answers:

S
sbellAug 17, 2025
How to fix a Viking MB 650 Lawn Mower when the engine doesn't start?
- X
  xmayAug 17, 2025
  If your Viking Lawn Mower engine doesn't start, the issue might be a detached or defective motorstop cable (attach or replace it), a detached, defective, or incorrectly adjusted throttle cable (attach, replace, or adjust it), a blocked air filter, a defective spark plug, a detached spark plug socket, or a defective fuel line (replace defective parts, attach the spark plug socket, and check for an ignition spark). It could also be a defective auto-choke (replace the Ready-Start device) or a bent motorstop cable fastening clip (adjust the fastening clip).
C
chad05Aug 19, 2025
What to do if my Viking Lawn Mower engine is overheating?
- L
  Laura RichardAug 19, 2025
  If your Viking Lawn Mower engine is overheating, it could be due to dirty cooling ribs or engine parts, which require cleaning. Another possible cause is a low engine oil level, which you should top up.
B
Brett LewisAug 22, 2025
Why is my Viking MB 650 Lawn Mower hard to start and losing power?
- T
  Tristan ClementsAug 22, 2025
  If your Viking Lawn Mower is hard to start and the engine power deteriorates, it could be due to dirty fuel, a dirty fuel filter, a dirty air filter, or a dirty spark plug. To resolve this, clean the fuel tank, check the fuel lines, clean the fuel filter, and clean or replace the spark plug. A blocked carburetor could also be the cause, requiring you to clean the carburetor.
K
Keith WadeAug 26, 2025
How to troubleshoot the electric start on my Viking Lawn Mower?
- J
  Jimmy ScottAug 26, 2025
  If the electric start on your Viking Lawn Mower is not functioning, the starter battery might be discharged or defective; charge or replace it. Also, check for loose wires or a defective wiring harness, and check and replace the wiring harness if necessary. The ignition lock might also be defective, so check and replace it if needed. Finally, the starter itself could be defective, so check the starter.
J
Jamie Frank MDAug 28, 2025
Why doesn't my Viking MB 650 engine brake properly?
- S
  smithamandaAug 28, 2025
  If your Viking Lawn Mower engine isn't braking, the throttle cable might be detached, defective, or incorrectly adjusted; in this case, you should attach, replace, or adjust it. Another possibility is a bent motorstop cable fastening clip, which requires adjustment. Finally, the brake itself might be defective and require repair.
P
Patricia BakerAug 31, 2025
Why does my Viking MB 650 have no drive?
- H
  Hailey ClarkAug 31, 2025
  If your Viking Lawn Mower has no drive, the wheel drive cable might be incorrectly adjusted or defective; adjust or replace it. Other potential causes include a defective V-belt (replace it), a defective drive pinion (replace it), a defective V-belt pulley (replace it), or a defective gearbox (replace it).
J
Jennifer BishopSep 2, 2025
What causes an uneven cut with my Viking MB 650?
- M
  Maurice RoseSep 2, 2025
  An uneven cut with your Viking Lawn Mower can be caused by a blunt or worn mowing blade; re-sharpen or replace it. It may also be due to a bent catcher bag tab; replace the lower part of the catcher bag. Another cause might be a bent guiding plate, which you should replace.
V
Victoria Smith DDSSep 5, 2025
What to do if the blade clutch is defective on my Viking MB 650?
- P
  patelnatashaSep 5, 2025
  If the blade clutch on your Viking Lawn Mower is defective, it could be due to a detached or defective blade clutch cable; attach or replace the blade clutch. It may also be caused by a defective brake band (replace the brake band), a defective blade clutch lever (check and replace if necessary), a defective brake band lever (check and replace if necessary), or defective clutch parts such as linings, drums, shoes, thrust springs, or a stop plate (remove the blade clutch and replace the defective parts).
J
Jody MitchellSep 8, 2025
Why is the vario drive speed control not working on my Viking MB 650?
- R
  Rebecca HannaSep 8, 2025
  If the Vario drive speed control on your Viking Lawn Mower isn't functioning, the Vario cable might be detached or defective; attach or replace the Vario cable and check the Vario gearbox return spring. It could also be that the Vario adjustment element or Vario ball bearing is defective; replace the adjustment element and ball bearing. A defective Vario lever could also be the cause; check and replace the Vario lever if necessary.
T
Tammy LeeSep 12, 2025
What to do if I cannot shift gears on my Viking MB 650?
- G
  gcrosbySep 12, 2025
  If you cannot shift gears on your Viking Lawn Mower, the three-speed gearshift cable might be detached or defective; attach or replace the three-speed gearshift cable and check the three-speed gearbox return spring. Another cause could be a defective three-speed lever; check and replace the three-speed lever if necessary. It is also possible that the gearbox is defective; repair or replace the gearbox.

Viking MB 650 Specifications

General

Brand	Viking
Model	MB 650
Category	Lawn Mower
Language	English

Summary

Notes on the Repair Instructions

General

Explanation of graphic symbols used in the repair instructions for better understanding.

Modifications

Information on how modified appliance operations are documented in the manual.

Preface

Safety Instructions

Essential safety precautions to follow before and during repair work on the lawn mower.

Handlebar

Replacing Cable Guide

Instructions for removing and installing the cable guide on the handlebar.

Replacing Reinforcement Strut

Procedure for removing and installing the reinforcement strut for the handlebar.

Opening Housing Halves

Steps for opening the right housing half of the handlebar assembly.

Control Bars and Levers

Replacing Wheel Drive Control Bar

Instructions for removing and installing the wheel drive control bar.

Replacing Motorstop Control Bar

Procedure to remove and install the motorstop control bar.

Replacing Blade Stop / Quick-Start Control Bar

Steps for removing and installing the blade stop/quick-start control bar.

Blade Clutch / Quick-Start Lever

Removing Blade Clutch / Quick-Start Lever

Instructions for removing the blade clutch or quick-start lever.

Dismantling Blade Clutch / Quick-Start Lever

Procedure for dismantling the blade clutch or quick-start lever.

Assembling Blade Clutch / Quick-Start Lever

Steps for assembling the blade clutch or quick-start lever.

Installing Blade Clutch / Quick-Start Lever

Instructions for installing the blade clutch or quick-start lever.

Chassis

Replacing Front Axle

Procedure for removing and installing the front axle assembly.

Dismantling Front Axle

Steps for dismantling the front axle.

Assembling Front Axle

Instructions for assembling the front axle.

Installing Front Axle

Procedure for installing the front axle.

Replacing Rear Axle

Removing Rear Axle (with Gearbox)

Instructions for removing the rear axle assembly including the gearbox.

Dismantling Rear Axle

Removing Axle (with Gearbox)

Steps for removing the axle with gearbox from the housing.

Assembling Rear Axle

Removing Bearing and Washer

Procedure for removing bearing and washer from axle bushing.

Inserting Washer and Bearing

Instructions for inserting washer and bearing into axle bushing.

Replacing Wheel Cap

Removing Front Wheel Cap

Instructions for removing the front wheel cap.

Removing Rear Wheel Cap

Procedure for removing the rear wheel cap.

Replacing Wheel

Removing Front Wheel

Steps for removing the front wheel.

Removing Rear Wheel

Instructions for removing the rear wheel.

Replacing Wheel Bearing

Removing Wheel Bearing

Procedure for removing wheel bearings using a punch.

Installing Wheel Bearing

Instructions for pressing in wheel bearings and installing spacer sleeve.

Replacing Rear Wheel Cover

Removing Rear Wheel Cover

Steps for removing the rear wheel cover.

Replacing Drive Pinion

Removing Right Drive Pinion

Instructions for removing the right drive pinion.

Removing Left Drive Pinion

Procedure for removing the left drive pinion.

Housing

Replacing Housing

Instructions for removing and installing the main housing.

Replacing Housing Cover Assembly

Procedure for removing and attaching the housing cover assembly.

Replacing Height Adjustment Handle

Removing Height Adjustment Handle

Steps for removing the height adjustment handle.

Installing Height Adjustment Handle

Instructions for installing the height adjustment handle.

Replacing Spring

Removing Spring

Procedure for removing the spring.

Installing Spring

Instructions for installing the spring.

Replacing Flap

Removing Flap

Steps for removing the flap.

Installing Flap

Instructions for installing the flap.

Replacing Handle Shell

Removing Handle Shell

Procedure for removing the handle shell.

Installing Handle Shell

Instructions for installing the handle shell.

Replacing Translatory Lever Cover

Removing Translatory Lever Cover

Steps for removing the translatory lever cover.

Installing Translatory Lever Cover

Instructions for installing the translatory lever cover.

Replacing Sight Glass

Removing Sight Glass

Procedure for removing the sight glass.

Installing Sight Glass

Instructions for installing the sight glass.

Replacing V-belt Cover

Removing V-belt Cover

Steps for removing the V-belt cover.

Installing V-belt Cover

Instructions for installing the V-belt cover.

Gearbox

Replacing Gearbox

Instructions for removing and installing the gearbox.

Replacing V-belt Pulley

Procedure for removing and installing V-belt pulleys.

Replacing Vario V-belt Pulley Ball Bearing

Removing Vario V-belt Pulley Ball Bearing

Steps for removing the Vario V-belt pulley ball bearing.

Installing Vario V-belt Pulley Ball Bearing

Instructions for installing the Vario V-belt pulley ball bearing.

Replacing Gearbox Support

Removing Single-speed/Vario Gearbox Support

Procedure for removing the single-speed or Vario gearbox support.

Installing Single-speed/Vario Gearbox Support

Instructions for installing the single-speed or Vario gearbox support.

Removing Three-speed Gearbox Support

Steps for removing the three-speed gearbox support.

Installing Three-speed Gearbox Support

Instructions for installing the three-speed gearbox support.

Height Adjustment

Replacing Height Adjustment Spring

Instructions for removing and installing the height adjustment spring.

Replacing Detent Segment Tension Spring

Procedure for removing and installing the detent segment tension spring.

Replacing Translatory Lever

Steps for removing and installing the translatory lever.

Troubleshooting

Engine Does Not Start

Diagnosing and resolving issues when the engine fails to start.

Problems When Starting, Engine Power Deteriorates

Troubleshooting steps for engine power issues during starting.

Engine Overheating

Addressing causes and solutions for engine overheating.

Engine Does Not Brake

Diagnosing and fixing issues related to the engine brake.

Maintenance Table

Torque Values

Related product manuals

Viking MB 650 User Manual

Table of Contents

Questions and Answers:

Viking MB 650 Specifications

Summary

Notes on the Repair Instructions

General

Modifications

Preface

Safety Instructions

Handlebar

Replacing Cable Guide

Replacing Reinforcement Strut

Opening Housing Halves

Control Bars and Levers

Replacing Wheel Drive Control Bar

Replacing Motorstop Control Bar

Replacing Blade Stop / Quick-Start Control Bar

Blade Clutch / Quick-Start Lever

Removing Blade Clutch / Quick-Start Lever

Dismantling Blade Clutch / Quick-Start Lever

Assembling Blade Clutch / Quick-Start Lever

Installing Blade Clutch / Quick-Start Lever

Chassis

Replacing Front Axle

Dismantling Front Axle

Assembling Front Axle

Installing Front Axle

Replacing Rear Axle

Removing Rear Axle (with Gearbox)

Dismantling Rear Axle

Removing Axle (with Gearbox)

Assembling Rear Axle

Removing Bearing and Washer

Inserting Washer and Bearing

Replacing Wheel Cap

Removing Front Wheel Cap

Removing Rear Wheel Cap

Replacing Wheel

Removing Front Wheel

Removing Rear Wheel

Replacing Wheel Bearing

Removing Wheel Bearing

Installing Wheel Bearing

Replacing Rear Wheel Cover

Removing Rear Wheel Cover

Replacing Drive Pinion

Removing Right Drive Pinion

Removing Left Drive Pinion

Housing

Replacing Housing

Replacing Housing Cover Assembly

Replacing Height Adjustment Handle

Removing Height Adjustment Handle

Installing Height Adjustment Handle

Replacing Spring

Removing Spring

Installing Spring

Replacing Flap

Removing Flap

Installing Flap

Replacing Handle Shell

Removing Handle Shell

Installing Handle Shell

Replacing Translatory Lever Cover

Removing Translatory Lever Cover

Installing Translatory Lever Cover

Replacing Sight Glass

Removing Sight Glass

Installing Sight Glass

Replacing V-belt Cover

Removing V-belt Cover

Installing V-belt Cover

Gearbox

Replacing Gearbox

Replacing V-belt Pulley

Replacing Vario V-belt Pulley Ball Bearing

Removing Vario V-belt Pulley Ball Bearing

Installing Vario V-belt Pulley Ball Bearing

Replacing Gearbox Support