Diamond Products CB21H-XL - Manual (Page 27)

HOSES: Large diameters and short
lengths are preferred and offer the highest
system efficiency. If one is operating 50 ft
(15.2M) from the power source, there is
also a 50 ft (15.2M) return for a 100 ft
(35.5M) total hose length. With 12 GPM
and oil at 100 deg. F (37.8C), this could
result in a 300 psi (20.6 Bar) pressure loss
with ½” hose and a 100 psi (6.9 Bar) loss
with 5/8” hose. Pressure loss will change
dramatically with oil temperature.
OPERATING INSTRUCTIONS
Operator Responsibilities
It is the operator’s responsibility to use this
unit and any attached tools under safe
working conditions and to follow proper
safety procedures for themselves, co-
workers, observers, and the public at large.
The operator must be aware of the
machine’s capabilities and limitations and
follow the safety precautions in each
section of this manual. Periodic
maintenance is required, in accordance
with the instructions herein, to promote
safe and reliable operations.
WARNING: Keep bystanders out of the
immediate work area.
Wear approved:
 Safety
glasses
 Ear
protection
 Hard
hat
 Gloves
 Safety shoes

Any other protective equipment
required for compliance with standard
safety practices or federal, state, and
local codes and regulations
Hose Connections: It is best to connect
the hoses to the unit before starting as
even very low residual pressure can make
hose installation more difficult. Push
couplings together until you hear it click.
Turn locking ring of coupling to the secured
position.
Gas Engine: Make sure that the engine
crankcase is filled with oil to the proper
level! Refer to your engine manual for oil
checking and changing procedures, along
with oil specifications, etc.
IMPORTANT: Operating the engine
without oil will ruin the engine.
Fuel: Use regular grade unleaded
gasoline to fuel the engine. Premium
grade may be used if necessary. Fill the
tank when the engine is off and has been
allowed to cool. Care should be taken to
prevent spilling fuel. Do not overfill the
fuel tank. Always leave enough space for
expansion due to environmental heating.
WARNING: In the event of fuel spillage,
do not start the engine or operate any
nearby electrical component until the
spilled fuel has been removed.
Starting Procedure:
 Set the flow control valve to zero.
 Open the fuel shut off valve below the
gas tank.
 Be certain the emergency off switch
has been pulled out.
 Set throttle at about 1/3, set choke if
necessary (cold engine). Turn key to
start and release. Refer to engine
manual for details of control functions.
 Let engine warm and gradually open
the choke and set the throttle to
maximum.
DANGER: Exhaust from the gas engine
contains carbon monoxide, a
poisonous, odorless, invisible gas,
which can cause serious illness or
death. Do not operate the gas engine
where ventilation is restricted. Open
windows and doors may not be
sufficient to prevent this hazard.
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