MULTIQUIP Mikasa Series Guide

OPERATION AND PARTS MANUAL
THIS MANUAL MUST ACCOMPANY THE EQUIPMENT AT ALL TIMES.
To find the latest revision of this
publication, visit our website at:
www.multiquip.com
SERIES
MODEL MRH800GS
Vibratory Roller
(HONDA GX390K1SM32/GX390U1SM32/
GX390UT2SM32/GX390UT2SCM1
GASOLINE ENGINES)
Revision #9 (11/07/18)

PAGE 2 — MRH800GS VIBRATORY ROLLER • OPERATION AND PARTS MANUAL — REV. #9 (11/07/18)
PROPOSITION 65 WARNING

MRH800GS VIBRATORY ROLLER • OPERATION AND PARTS MANUAL — REV. #9 (11/07/18) — PAGE 3
NOTES

PAGE 4 — MRH800GS VIBRATORY ROLLER • OPERATION AND PARTS MANUAL — REV. #9 (11/07/18)
TABLE OF CONTENTS
MRH800GS Vibratory Roller
Proposition 65 Warning ........................................... 2
Table Of Contents.................................................... 4
Parts Ordering Procedures...................................... 5
Safety Information .............................................. 6-10
Specifications (Roller)............................................ 12
Specifications (Engine).......................................... 13
Dimensions............................................................ 14
General Information............................................... 15
Components ..................................................... 16-19
Basic Engine.......................................................... 20
Inspection ......................................................... 22-23
Operation.......................................................... 24-26
Maintenance..................................................... 27-33
Electromagnetic Clutch.......................................... 34
Troubleshooting (Roller) ........................................ 35
Troubleshooting (Engine).................................. 36-37
Explanation Of Code In Remarks Column............. 38
Suggested Spare Parts ......................................... 39
Roller Component Drawings
Nameplate And Decals..................................... 40-43
Axle Assembly .................................................. 44-45
Base Assembly................................................. 46-47
Front Guard Assembly...................................... 48-49
Side Cover Assembly ....................................... 50-51
Water Tank Assembly ....................................... 52-53
Hydraulic System Assembly ............................. 54-57
Hydraulic Oil Tank Assembly ............................ 58-59
Engine Assembly.............................................. 60-63
Electric Device Assembly.................................. 64-65
Clutch (Vibration) Assembly ............................. 66-67
Vibrator Assembly ............................................ 68-69
Upper Control Arm Assembly........................... 70-71
Lower Control Arm Assembly........................... 72-73
Honda GX390 Series Engines
Cylinder Head Assembly................................... 74-75
Cylinder Barrel Assembly.................................. 76-77
Crankcase Cover Assembly.............................. 78-79
Crankshaft Assembly........................................ 80-81
Piston Assembly................................................ 82-83
Camshaft Assembly.......................................... 84-85
Recoil Starter Assembly.................................... 86-87
Fan Cover Assembly......................................... 88-89
Carburetor Assembly........................................ 90-93
Air Cleaner Assembly (Standard)..................... 94-95
Air Cleaner Assembly (Cyclone)....................... 96-97
Muffler Assembly............................................... 98-99
Fuel Tank Assembly...................................... 100-101
Flywheel Assembly....................................... 102-103
Ignition Coil Assembly .................................. 104-105
Starter Motor Assembly................................ 106-107
Control Assembly ......................................... 108-109
Control Box Assembly .................................. 110-111
Label Assembly ............................................ 112-113
Terms and Conditions of Sale — Parts ............... 114
NOTICE
Specifications and part numbers are subject to change
without notice.

MRH800GS VIBRATORY ROLLER • OPERATION AND PARTS MANUAL — REV. #9 (11/07/18) — PAGE 5
PARTS ORDERING PROCEDURES
www.multiquip.com
Ordering parts has never been easier!
Choose from three easy options:
WE ACCEPT ALL MAJOR CREDIT CARDS!
When ordering parts, please supply:
❒Dealer Account Number
❒Dealer Name and Address
❒Shipping Address (if different than billing address)
❒Return Fax Number
❒Applicable Model Number
❒Quantity, Part Number and Description of Each Part
❒Specify Preferred Method of Shipment:
✓ UPS/Fed Ex ✓DHL
■Priority One ✓Tr u ck
■Ground
■Next Day
■Second/Third Day
If you have an MQ Account, to obtain a Username
and Password, E-mail us at:
parts@multiquip.
com.
To obtain an MQ Account, contact your
District Sales Manager for more information.
Order via Internet (Dealers Only):
Order parts on-line using Multiquip’s SmartEquip website!
■View Parts Diagrams
■Order Parts
■Print Specification Information
Note: Discounts Are Subject To Change
Goto www.multiquip.com and click on
Order Parts to log in and save!
Use the internet and qualify for a 5% Discount
on Standard orders for all orders which include
complete part numbers.*
Order via Fax (Dealers Only):
All customers are welcome to order parts via Fax.
Domestic (US) Customers dial:
1-800-6-PARTS-7 (800-672-7877)
Fax your order in and qualify for a 2% Discount
on Standard orders for all orders which include
complete part numbers.*
Order via Phone: Domestic (US) Dealers Call:
1-800-427-1244
Best Deal!
International Customers should contact
their local Multiquip Representatives for
Parts Ordering information.
Non-Dealer Customers:
Contact your local Multiquip Dealer for
parts or call 800-427-1244 for help in
locating a dealer near you.
Note: Discounts Are Subject To Change
Effective:
January 1st
, 2006
NOTICE
All orders are treated as Standard Orders and will
ship the same day if received prior to 3PM PST.

PAGE 6 — MRH800GS VIBRATORY ROLLER • OPERATION AND PARTS MANUAL — REV. #9 (11/07/18)
SAFETY INFORMATION
Do not operate or service the equipment before reading
the entire manual. Safety precautions should be followed
at all times when operating this equipment.
Failure to read and understand the safety
messages and operating instructions could
result in injury to yourself and others.
SAFETY MESSAGES
The four safety messages shown below will inform you
about potential hazards that could injure you or others.The
safety messages specifically address the level of exposure
to the operator and are preceded by one of four words:
DANGER, WARNING, CAUTION
or NOTICE.
SAFETY SYMBOLS
DANGER
Indicates a hazardous situation which, if not avoided,
WILL result in DEATH or SERIOUS INJURY.
WARNING
Indicates a hazardous situation which, if not avoided,
COULD result in DEATH or SERIOUS INJURY.
CAUTION
Indicates a hazardous situation which, if not avoided,
COULD result in MINOR or MODERATE INJURY.
NOTICE
Addresses practices not related to personal injury.
The following table shows the potential hazards associated
with the operation of this equipment.
Lethal exhaust gas hazards
Explosive fuel hazards
Burn hazards
Respiratory hazards
Rotating parts hazards
Symbol Safety Hazard
Pressurized fluid hazards
Electric shock hazards
Runover hazards

MRH800GS VIBRATORY ROLLER • OPERATION AND PARTS MANUAL — REV. #9 (11/07/18) — PAGE 7
SAFETY INFORMATION
GENERAL SAFETY
CAUTION

NEVER operate this equipment without proper protective
clothing, shatterproof glasses, respiratory protection,
hearing protection, steel-toed boots and other protective
devices required by the job or city and state regulations.

NEVER operate this equipment when not
feeling well due to fatigue, illness or when
under medication.

NEVER operate this equipment under the influence of
drugs or alcohol.

ALWAYS check the equipment for loosened threads or
bolts before starting.

DO NOT use the equipment for any purpose other than
its intended purposes or applications.

ALWAYS clear the work area of any debris, tools, etc.
that would constitute a hazard while the equipment is
in operation.
NOTICE

This equipment should only be operated by trained and
qualified personnel 18 years of age and older.

Whenever necessary, replace nameplate, operation and
safety decals when they become difficult read.

Manufacturer does not assume responsibility for any
accident due to equipment modifications. Unauthorized
equipment modification will void all warranties.
NEVER
use accessories or attachments that are not
recommended by Multiquip for this equipment. Damage
to the equipment and/or injury to user may result.
ALWAYS know the location of the nearest
fire extinguisher.
ALWAYS know the location of the nearest
first aid kit.
ALWAYS know the location of the nearest phone or
keep
a phone on the job site.
Also, know the phone numbers
of the nearest ambulance, doctor and
fire department.
This information will be invaluable in the case of an
emergency.

PAGE 8 — MRH800GS VIBRATORY ROLLER • OPERATION AND PARTS MANUAL — REV. #9 (11/07/18)
SAFETY INFORMATION
ROLLER SAFETY
DANGER

NEVER operate the equipment in an explosive
atmosphere or near combustible materials.An
explosion or fire could result causing severe
bodily harm or even death.
WARNING

NEVER disconnect any emergency or safety devices.
These devices are intended for operator safety.
Disconnection of these devices can cause severe injury,
bodily harm or even death. Disconnection of any of these
devices will void all warranties.
CAUTION

NEVER lubricate components or attempt service on a
running machine.

Never leave the roller unattended with the engine
running. Turn off engine.

Use chock blocks when parking roller on a grade.

Use extreme care when operating near obstructions, on
slippery surfaces, grades, and slide slopes.

When reversing, particularly on the edges and banks
of ditches, as well as in front of obstaces, the operator
must stay in a standing position at a safe distance from
the machine.

When operating near any house/building or pipelines,
always check the effect of machine vibration. Stop work
if necessary.

DO NOT operate the roller with the covers open.

ALWAYS keep the machine away from other personnel
and obstacles. Always keep immediate are free of
bystanders.
NOTICE

ALWAYS keep the machine in proper running condition.

Fix damage to machine and replace any broken parts
immediately.
DO NOT use worn-out hoses or couplings. Inspect daily.
ALWAYS
store equipment properly when it is not being
used. Equipment should be stored in a clean, dry location
out of the reach of children and unauthorized personnel.
ENGINE SAFETY
DANGER

The engine fuel exhaust gases contain poisonous carbon
monoxide. This gas is colorless and odorless, and can
cause death if inhaled.

The engine of this equipment requires an adequate
free flow of cooling air. NEVER
operate this equipment
in any enclosed or narrow
area where free flow of the
air is restricted. If the air
flow is restricted it will cause
injury to people and property
and serious damage to the
equipment or engine.
WARNING
DO NOT
place hands or fingers inside engine
compartment when engine is running.
NEVER
operate the engine with heat shields or
guards removed.
Keep fingers, hands hair and clothing away
from all moving parts to prevent injury.
DO NOT remove the engine oil drain plug
while the engine is hot. Hot oil will gush out of the oil
tank and severely scald any persons in the general area
of the roller.
CAUTION
NEVER touch the hot exhaust manifold,
muffler or cylinder. Allow these parts to cool
before servicing equipment.

Always turn the engine off before performing maintenance.
DANGEROUS
GAS FUMES

MRH800GS VIBRATORY ROLLER • OPERATION AND PARTS MANUAL — REV. #9 (11/07/18) — PAGE 9
SAFETY INFORMATION
NOTICE
NEVER run engine without an air filter or with a dirty air
filter. Severe engine damage may occur. Service air filter
frequently to prevent engine malfunction.
NEVER tamper with the factory settings
of the engine or engine governor. Damage
to the engine or equipment can result
if operating in speed ranges above the
maximum allowable.
NEVER tip the engine to extreme angles during lifting as
it may cause oil to gravitate into the cylinder head, making
the engine start difficult.
FUEL SAFETY
DANGER
DO NOT add fuel to equipment if it is placed inside truck
bed with plastic liner. Possibility exists of explosion or
fire due to static electricity.
DO NOT start the engine near spilled fuel or combustible
fluids. Diesel fuel is extremely flammable and its vapors
can cause an explosion if ignited.
ALWAYS refuel in a well-ventilated area, away from
sparks and open flames.
ALWAYS use extreme caution when working with
flammable liquids.
DO NOT fill the fuel tank while the engine is running
or hot.
FUEL
FUEL
DO NOT overfill tank, since spilled fuel could ignite if it
comes into contact with hot engine parts or sparks from
the ignition system.

Store fuel in appropriate containers, in well-ventilated
areas and away from sparks and flames.
NEVER use fuel as a cleaning agent.
DO NOT smoke around or near the
equipment. Fire or explosion could result
from fuel vapors or if fuel is spilled on a
hot engine.
BATTERY SAFETY (ELECTRIC START ONLY)
DANGER
DO NOT
drop the battery. There is a possibility that the
battery will explode.
DO NOT expose the battery to open flames,
sparks, cigarettes, etc.The battery contains
combustible gases and liquids. If these
gases and liquids come into contact with a
flame or spark, an explosion could occur.
WARNING
ALWAYS wear safety glasses when
handling the battery to avoid eye irritation.
The battery contains acids that can cause
injury to the eyes and skin.
Use well-insulated gloves when picking up
the battery.
ALWAYS
keep the battery charged. If the battery is not
charged, combustible gas will build up.
DO NOT
charge battery if frozen. Battery can explode.
When frozen, warm the battery to at least 61°F (16°C).
ALWAYS
recharge the battery in a well-ventilated
environment to avoid the risk of a dangerous concentration
of combustible gases.
If the battery liquid (dilute sulfuric acid)
comes into contact with clothing or skin,
rinse skin or clothing immediately with
plenty of water.

PAGE 10 — MRH800GS VIBRATORY ROLLER • OPERATION AND PARTS MANUAL — REV. #9 (11/07/18)
SAFETY INFORMATION
If the battery liquid (dilute sulfuric acid) comes into
contact with eyes, rinse eyes immediately with plenty
of water and contact the nearest doctor or hospital to
seek medical attention.
CAUTION

ALWAYS disconnect the NEGATIVE battery terminal
before performing service on the equipment.

ALWAYS keep battery cables in good working condition.
Repair or replace all worn cables.
TRANSPORTING SAFETY
CAUTION

NEVER allow any person or animal to stand underneath
the equipment while lifting.
NOTICE

Before lifting, make sure that the equipment parts are not
damaged and screws are not loose or missing.

Use lifting equipment capable of lifting the weight of
the roller.

Always make sure crane or lifitng device has been
properly secured to the lifting bail (hook) of the
equipment.

ALWAYS shutdown engine before transporting.

NEVER lift the equipment while the engine is running.

Tighten fuel tank cap securely and close fuel cock to
prevent fuel from spilling.

Use adequate lifting cable (wire or rope) of sufficient
strength.

Use one point suspension hook and lift straight upwards
with sufficient bearing capacity to prevent machine from
tilting or slipping.

DO NOT lift machine to unnecessary heights.

ALWAYS make sure that roller is secured correctly when
transporting on a trailer. Make sure all supports attaching
the roller to the trailer are tight.
ENVIRONMENTAL SAFETY
NOTICE
Dispose of hazardous waste properly.
Examples of potentially hazardous waste
are used motor oil, fuel and fuel filters.
DO NOT
use food or plastic containers to dispose of
hazardous waste.
DO NOT
pour waste, oil or fuel directly onto the ground,
down a drain or into any water source.

MRH800GS VIBRATORY ROLLER • OPERATION AND PARTS MANUAL — REV. #9 (11/07/18) — PAGE 11
NOTES

PAGE 12 — MRH800GS VIBRATORY ROLLER • OPERATION AND PARTS MANUAL — REV. #9 (11/07/18)
SPECIFICATIONS (ROLLER)
Table 1. Specifications (Vibratory Roller)
Dimensions (LxWxH) 105 x 27.2 x 46 in
(2670 x 692 x 1060 mm)
Drum Diameter 16 in. (406 mm)
Drum Width 25.6 in. (650 mm)
Curb Clearance 9.4 in. (238 mm)
Side Overhang .83 in.(21 mm)
Operating Weight (with water) 1530 lbs. (694 kg.)
Vibration Frequency 3,300 vpm
Centrifugal Force 5,283 lbs (23.5 kn)
Drive System Hydraulic Motor
Vibration System Frame
Vibration Method Belt Drive
Vibrator Shaft Twin
Gradeablility 20 degrees
Working Speed 0 - 3 mph (0 - 4.8 kph)
Fuel Tank Capacity 1.88 gallons (7.1 liters)
Lubricating Oil 6.6 gallons (25 liters)
Water Tank Capacity 10.57 gallons (40 liters)

MRH800GS VIBRATORY ROLLER • OPERATION AND PARTS MANUAL — REV. #9 (11/07/18) — PAGE 13
Table 2. Specifications (Engine)
Engine Make HONDA
Engine Model GX390K1SM32 GX390U1SM32 GX390UT2SM32 GX390UT2SCM1
Engine Type Air-cooled 4 stroke, Single Cylinder, OHV,
Horizontal Shaft Gasoline Engine
Cylinder Bore X Stroke 3.5 in. X 2.5 in.
(88 mm x 64 mm.)
Displacement 23.70 cu-in (389 cc))
Net Power
(In accordance with SAE
J1349*)
11 H.P. (8.2 kW).
Fuel Tank Capacity 1.61 gallons (6.1 liters)
Fuel Unleaded Automobile Gasoline
Oil Capacity 1.2 quarts (1.1 liters)
Oil Alert System Ye s
Air Cleaner Standard Cyclone
Speed Control Method Centrifugal Fly-weight Type
Starting Method Electric/Recoil Start
Dry Net Weight 69.4 lbs (35 Kg.)
Dimensions (L x W x H) 15.0 x 17.7 X 17.4 in.
(380 X 450 X 443 mm.)
*The power rating of the engine is the net power output tested on a production engine and measured in accordance
with SAE J1349 at 3,600 rpm (net power) and at 2,500 rpm (max net torque). Mass production engines may vary
from this value. Actual power output for the engine installed in the machine will vary depending on numerous factors,
including the operating speed of the engine in application, environmental conditions, maintenance and other variables
SPECIFICATIONS (ENGINE)

PAGE 14 — MRH800GS VIBRATORY ROLLER • OPERATION AND PARTS MANUAL — REV. #9 (11/07/18)
DIMENSIONS
Table 3. Dimensions
LENGTH
A 105 in. 2670 mm.
B 58 in. 1470 mm.
C 10 in. 255 mm.
D 22.8 in. 580 mm.
E 13.8 in. 350 mm.
WIDTH F 27.2 in. 692 mm.
G 13.6 in. 346 mm.
HEIGHT
H 78.3 in. 1990 mm.
I 46.0 in. 1170 mm.
J 37.4 in. 950 mm.
K 44.1 in. 1120 mm.
L 9.4 in. 238 mm.
Figure 1. MRH800GS Dimensions

MRH800GS VIBRATORY ROLLER • OPERATION AND PARTS MANUAL — REV. #9 (11/07/18) — PAGE 15
GENERAL INFORMATION
The Mikasa Model MRH800GS is a powerful compacting
tool capable of applying tremendous force in consecutive
impacts to a soil surface. Applications include soil
compacting for backfilling for gas pipelines, water pipelines
and cable installation work.
The impact force of the MRH800GS levels and uniformly
compacts voids between soil particles to increase dry
density.
Features include:
Hydraulic transmission to allow speed change without
gear shifting.
Deadman device which when pressed or hit will cause
the travel lever to return to neutral position bringing the
machine to a stop.
A horn to warn of machine’s approach.
Non-corrosive water tank for the sprinkler system with
a capacity of more than 10 gallons.
Lifting hook to transport machine.
Front bumper and working light.
Narrow profile with less than one inch wall clearance.
Narrower width allows access to tighter areas. No
exposed hydraulic hoses.
Oil bath lubricated bearings and external vibration for
less servicing and more dependability.
Front and rear drum scrapers.
Drum sprinkler system controls located near the operator.
Easy access to hydraulic components and hydraulic filter.

PAGE 16 — MRH800GS VIBRATORY ROLLER • OPERATION AND PARTS MANUAL — REV. #9 (11/07/18)
COMPONENTS
1
3
5
6
7
89
10
11
2
4
Figure 2. MRH800GS Components

MRH800GS VIBRATORY ROLLER • OPERATION AND PARTS MANUAL — REV. #9 (11/07/18) — PAGE 17
COMPONENTS
Figure 2 illustrates the location of the major components
for the MRH800GS Vibration Roller. The function of each
component is described below:
1. Fuel Tank/Cap — Fill with diesel fuel. Fuel tank holds
approximately 2 gallons (7.5 liters). DO NOT top off
fuel. Wipe up any spilled fuel immediately.
2. Center Cover — When opened and supported by strut,
provides access to oil pump and filter, battery, V-belt,
and clutch box.
3. Vibration Rollers — 25-inch wide steel drums that
provide compaction force in the compaction and
patching of asphalt type surfaces.
4. Front Headlights — Activate using switch on control
handle. Use to illuminate ground during nighttime or
low-light operating conditions.
5. Hydraulic Oil Gauge — Indicates the hydraulic oil
level.
6. Oil Tank — Fill with proper grade of hydraulic oil.
7. Vibrator Oil Level Plug — Remove to check vibrator
oil level.
8. Lifting Hook — Used to lift the machine with crane or
other lifting device.
9. Engine — This machine uses the Honda GX390 series
gasoline engine. Refer to the engine Owner’s Manual
for more information.
10. Water Tank — Holds 10.57 gallons (40 liters) for the
sprinkler system.
11. Parking Brake — Makes sure machine will not
accidentally move when parked or not in use.

PAGE 18 — MRH800GS VIBRATORY ROLLER • OPERATION AND PARTS MANUAL — REV. #9 (11/07/18)
COMPONENTS
Figure 3. Handle Bar/Lever Components
PAGE 18 — MQ-MIKASA MRH-800GS VIBRATION ROLLER — PARTS & OPERATION MANUAL — REV. #7 (07/ 09/10)
MRH-800GS — HANDLE BAR/LEVER COMPONENTS
Figure 4. MRH-800GS Lever Components
1
2
3
4
5
6

MRH800GS VIBRATORY ROLLER • OPERATION AND PARTS MANUAL — REV. #9 (11/07/18) — PAGE 19
COMPONENTS
HANDLE BAR/LEVER COMPONENTS
Figure 3 illustrates the location of the major lever
components on the handle bar of the machine. Each
component is described below:
1. Travel Lever — Controls the direction of travel of the
machine (forward and reverse).
2. Horn Button — When pressed, gives a warning sound
of the machine approaching.
3. Vibration Lever — Turns vibration on and off.
4. Throttle Lever — Controls the start up of the machine.
5. Dead-Man Device — When pressed or hit while
traveling in reverse, causes the travel lever to return
to neutral position to stop the machine.
6. Light ON/OFF Switch — Turns headlight on and off.

PAGE 20 — MRH800GS VIBRATORY ROLLER • OPERATION AND PARTS MANUAL — REV. #9 (11/07/18)
Figure 4. Engine Components
INITIAL SERVICING
The engine (Figure 4) must be checked for proper
lubrication and filled with fuel prior to operation. Refer to the
engine manufacturer’s manual for instructions and details
of operation and servicing.
1. Fuel Filler Cap — Remove this cap to add unleaded
gasoline to the fuel tank. Make sure cap is tightened
securely. DO NOT over fill.
1
2
3
4
5
6
7
8
9
10
DANGER
Adding fuel to the tank should be done
only when the engine is stopped and has
had an opportunity to cool down. In the
event of a fuel spill, DO NOT attempt to
start the engine until the fuel residue has
been completely wiped up, and the area surrounding
the engine is dry.
2. Throttle Lever — Used to adjust engine RPM speed
(lever advanced forward SLOW, lever back toward
operator FAST).
3. Engine ON/OFF Switch — ON position permits engine
starting, OFF position stops engine operations.
4. Recoil Starter (pull rope) — Manual-starting method.
Pull the starter grip until resistance is felt, then pull
briskly and smoothly.
5. Fuel Valve Lever — OPEN to let fuel flow, CLOSE to
stop the flow of fuel.
6. Choke Lever — Used in the starting of a cold engine,
or in cold weather conditions. The choke enriches the
fuel mixture.
7. Air Cleaner — Prevents dirt and other debris from
entering the fuel system. Remove wing-nut on top of
air filter cannister to gain access to filter element.
8. Spark Plug — Provides spark to the ignition system.
Set spark plug gap to 0.6 - 0.7 mm (0.028 - 0.031 inch)
Clean spark plug once a week.
9. Muffler — Used to reduce noise and emissions.
10. Fuel Tank — Holds unleaded gasoline. For additional
information refer to engine owner's manual.
NOTICE
Operating the engine without an air filter, with a
damaged air filter, or a filter in need of replacement
will allow dirt to enter the engine, causing rapid engine
wear.
WARNING
Engine components can generate extreme
heat. To prevent burns, DO NOT touch
these areas while the engine is running or
immediately after operating.NEVER operate
the engine with the muffler removed.
BASIC ENGINE