Ingersoll-Rand VHP400CMH User manual

Book 43212455 (11/03) 1
OPERATING, MAINTENANCE,
PARTS MANUAL
COMPRESSOR MODELS
VHP400CMH
VHP500CMH
VHP550CMH
HP600CMH
XP650CMH
P
ortable Powe
r
P
.O. Box 868
501 Sanford Ave
M
ocksville, N.C. 27028
www.portablepower.irco.com
Manual 43212455 (11/03)
This manual contains important safety information.
Do not destroy this manual.
This manual must be available to the personnel who operate and maintain this machine.
Doosan purchased Bobcat Company from Ingersoll-Rand Company in
2007. Any reference to Ingersoll-Rand Company or use of trademarks,
service marks, logos, or other proprietary identifying marks belonging
to Ingersoll-Rand Company in this manual is historical or nominative
in nature, and is not meant to suggest a current affiliation between
Ingersoll-Rand Company and Doosan Company or the products of
either.
Revised (10-12)

Book 43212455 (11/03)
2
Quality Policy
We will supply products and services that consistently meet the
requirements of our customers and each other.

Book 43212455 (11/03)
3
TABLE OF CONTENTS
SECTION 1 . . . . . SAFETY
SECTION 2 . . . . . WARRANTY
SECTION 3 . . . . . WARRANTY REGISTRATION
SECTION 4 . . . . . SYSTEM DESCRIPTION
SECTION 5 . . . . . INSTALLATION
SECTION 6 . . . . . OPERATION
SECTION 7 . . . . . GENERAL DATA
SECTION 8 . . . . . MAINTENANCE/LUBRICATION
SECTION 9 . . . . . PARTS ORDERING
SECTION 10 . . . . PARTS LIST
SECTION 11 . . . . COMMON FASTENERS

Book 43212455 (11/03)
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SECTION 1 – SAFETY
General Information
Never operate unit without first observing all safety warnings and carefully reading the operation and
maintenance manual shipped from the factory with this machine.
Ensure that the operator reads and understands the decals and consults the manuals before
maintenance or operation.
Ensure that maintenance personnel are adequately trained, competent and have read the Maintenance
Manuals.
Make sure that all protective covers are in place and that the canopy/doors are closed during operation.
The specification of this machine is such that the machine is not suitable for use in flammable gas risk
areas. If such an application is required then all local regulations, codes of practice and site rules must be
observed. To ensure that the machine can operate in a safe and reliable manner, additional equipment
such as gas detection, exhaust spark arrestors, and intake (shut-off) valves may be required, dependant
on local regulations or the degree of risk involved.
A weekly visual check must be made on all fasteners/fixing screws securing mechanical parts. In
particular, safety-related parts such as coupling hitch, drawbar components, road-wheels, and lifting bail
should be checked for total security.
All components which are loose, damaged or unserviceable, must be rectified without delay.
Air discharged from this machine may contain carbon monoxide or other contaminants which will cause
serious injury or death. Do not breathe this air.
This machine produces loud noise with the doors open or service valve vented. Extended exposure to
loud noise can cause hearing loss. Always wear hearing protection when doors are open or service valve
is vented.
Never inspect or service unit without first disconnecting battery cable(s) to prevent accidental starting.
Do not use petroleum products (solvents or fuels) under high pressure as this can penetrate the skin and
result in serious illness. wear eye protection while cleaning unit with compressed
air to prevent debris from injuring eye(s).
Rotating fan blade can cause serious injury. Do not operate without guard in place.
Use care to avoid contacting hot surfaces (engine exhaust manifold and piping, air receiver and air
discharge piping, etc.).
Ether is an extremely volatile, highly inflammable gas. When it is specified as a starting aid, use sparingly.
DO NOT USE ETHER IF THE MACHINE HAS GLOW PLUGS OR INLET HEATER STARTING AIDS OR
ENGINE DAMAGE WILL RESULT.

Book 43212455 (11/03)
5
Compressed Air
Compressed air can be dangerous if incorrectly handled. Before doing any work on the unit, ensure that
all pressure is vented from the system and that the machine cannot be started accidentally.
Ensure that the machine is operating at the rated pressure and that the rated pressure is known to all
relevant personnel.
All air pressure equipment installed in or connected to the machine must have safe working pressure
ratings of at least the machines safety valve setting.
If more than one compressor is connected to one common downstream plant, effective check valves and
isolation valves must be fitted and controlled by work procedures, so that one machine cannot
accidentally be pressurized/over pressurized by another.
Compressed air must not be used for a direct feed to any form of breathing apparatus or mask.
High Pressure Air can cause serious injury or death. Relieve pressure before removing filler plugs/caps,
fittings or covers.
Air pressure can remain trapped in air supply line which can result in serious injury or death. Always
carefully vent air supply line at tool or vent valve before performing any service.
The discharged air contains a very small percentage of compressor lubricating oil and care should be
taken to ensure that downstream equipment is compatible.
If the discharged air is to be ultimately released into a confined space, adequate ventilation must be
provided.
When using compressed air always use appropriate personal protective equipment.
All pressure containing parts, especially flexible hoses and their couplings, must be regularly inspected,
be free from defects and be replaced according to the Manual instructions.
Avoid bodily contact with compressed air.
The safety valve located in the separator tank must be checked periodically for correct operation.
Whenever the machine is stopped, air will flow back into the compressor system from devices or systems
downstream of the machine unless the service valve is closed. Install a check valve at the machine
service valve to prevent reverse flow in the event of an unexpected shutdown when the service valve is
open.
Disconnected air hoses whip and can cause serious injury or death. Always attach a safety flow restrictor
to each hose at the source of supply or branch line in accordance with OSHA Regulation 29CFR Section
1926.302(b).
Never allow the unit to sit stopped with pressure in the receiver-separator system.

Book 43212455 (11/03)
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Materials
The following substances may be produced during the operation of this machine:
brake lining dust
engine exhaust fumes
AVOID INHALATION
Ensure that adequate ventilation of the cooling system and exhaust gases is maintained at all times.
The following substances are used in the manufacture of this machine and may be hazardous to health if
used incorrectly:
• anti-freeze
• compressor lubricant engine lubricant
• preservative grease rust preventative diesel fuel
• battery electrolyte
AVOID INGESTION, SKIN CONTACT AND INHALATION OF FUMES.
Should compressor lubricant come into contact with the eyes, then irrigate with water for at least 5
minutes.
Should compressor lubricant come into contact with the skin, then wash off immediately.
Consult a physician if large amounts of compressor lubricant are ingested.
Consult a physician if compressor lubricant is inhaled.
Never give fluids or induce vomiting if the patient is unconscious or having convulsions.
Safety data sheets for compressor and engine lubricants should be obtained from the lubricant supplier.
Do NOT start or operate this machine in a confined area. Avoid breathing exhaust fumes when working
on or near the machine.
This machine may include such materials as oil, diesel fuel, antifreeze, brake fluid, oil/air filters and
batteries which may require proper disposal when performing maintenance and service tasks. Contact
local authorities for proper disposal of these materials.
Battery
A battery contains sulfuric acid and can give off gases which are corrosive and potentially explosive.
Avoid contact with skin, eyes and clothing. In case of contact, flush area immediately with water.
DO NOT ATTEMPT TO SLAVE START A FROZEN BATTERY SINCE THIS MAY CAUSE IT TO
EXPLODE.
Exercise extreme caution when using booster battery. To jump battery, connect ends of one booster
cable to the positive (+) terminal of each battery. Connect one end of other cable to the negative ( -)
terminal of the booster battery and other end to a ground connection away from dead battery (to avoid a
spark occurring near any explosive gases that may be present). After starting unit, always disconnect
cables in reverse order.

Book 43212455 (11/03)
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Radiator
Hot engine coolant and steam can cause injury. Ensure that the radiator filler cap is removed with due
care and attention.
Do not remove the pressure cap from a HOT radiator. Allow radiator to cool down before removing
pressure cap.
Transport
When Loading or transporting machines, ensure that the specified lifting and tie down points are used.
When loading or transporting machines, ensure that the towing vehicle, its size, weight, towing hitch and
electrical supply are all suitable to provide safe and stable towing at speeds either, up to the legal
maximum for the country in which it is being towed or, as specified for the machine model if lower than
the legal maximum. Do not exceed gross vehicle weight rating.
Before towing the machine, ensure that:
• Tires and towing hitch are in a serviceable condition. the canopy is secure.
• All ancillary equipment is stored in a safe and secure manner.
• Brakes and lights are functioning correctly and meet necessary road traffic requirements.
• Break-away cables/safety chains are connected to the towing vehicle.
The machine must be towed in a level attitude in order to maintain correct handling, braking and lighting
functions. This can be achieved by correct selection and adjustment of the vehicle towing hitch and, on
variable height running gear, adjustment of the drawbar.
1. Make sure wheels, tires and tow bar connectors are in safe operating condition and tow bar is
properly connected before towing.
2. When parking always use the handbrake and, if necessary, suitable wheel chocks.
Safety chains/connections and their adjustment where fitted:
Ensure that the breakaway cable is securely coupled to the
trailer and also to a substantial point on the towing vehicle.
Ensure that the cable length is as short as possible, while still allowing enough slackness for the trailer to
articulate without the handbrake being applied.
Loop the chains onto the towing vehicle using the towing vehicle hitch as an anchorage point, or any
other point of similar strength. Ensure that the effective chain length is as short as possible while still
allowing normal articulation of the trailer and effective operation of the breakaway cable.

Book 43212455 (11/03)
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IMPORTANT SAFETY INSTRUCTIONS

Book 43212455 (11/03)
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Book 43212455 (11/03)
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Book 43212455 (11/03)
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SECTION 2 - WARRANTY
Ingersoll-Rand, through its distributors, warrants to the initial user that each portable air compressor
manufactured by it, will be free of defects in material and workmanship for a period of the earlier of twelve
(12) months from shipment to or the accumulation of 2,000 hours of service by the initial user.
Portable compressor airends will be free of defects in material and workmanship for a period of the earlier
of twenty four months from shipment to or the accumulation of 4,000 hours of service by the initial user.
The warranty against defects will include replacement of the complete airend, provided the original airend
is returned assembled and unopened.
Portable Compressor Airend Limited Optional Warranty - The earlier of sixty (60) months from shipment to
or the accumulation of 10,000 hours of service. The optional warranty is limited to defects in rotors,
housings, bearings and gears and provided all the following conditions are met:
1. The original air end is returned assembled and unopened.
2. Continued use of genuine Ingersoll-Rand parts, fluids, oil and filters.
3. Maintenance is performed at prescribed intervals.
Oil-Free airends are fee-based and may require a maintenance agreement. Formal enrollment is
required.
Ingersoll-Rand will provide a new part or repaired part, at its election, in place of any part, which is found
upon its inspection to be defective in material and workmanship during the period prescribed above. Such
part will be repaired or replaced without charge to the initial user during normal working hours at the place
of business of an Ingersoll-Rand distributor authorized to sell the type of equipment involved or other
establishment authorized by Ingersoll-Rand. User must present proof of purchase at the time of
exercising warranty.
The above warranty does not apply to failures occurring as a result of abuse; misuse, negligent repairs,
corrosion, erosion and normal wear and tear, alterations or modifications made to the product without
express written consent of Ingersoll-Rand; or failure to follow the recommended operating practices and
maintenance procedures as provided in the product’s operating and maintenance publications.
Accessories or equipment furnished by Ingersoll-Rand, but manufactured by others, including, but not
limited to, engines, shall carry whatever warranty the manufacturers have conveyed to Ingersoll-Rand
and which can be passed on to the initial user.
THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMPLIED, (EXCEPT
THAT OF TITLE),AND THERE ARE NO WARRANTIES OF MERCHANTABILITY OR OF FITNESS FOR
A PARTICULAR PURPOSE.

Book 43212455 (11/03)
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SECTION 3 - WARRANTY REGISTRATION
Complete Machine Registration
Machines shipped to locations within the United States do not require a warranty
registration unless the machine status changes (i.e. change of ownership).
Machines shipped outside the United States require notification be made to initiate the
machine warranty.
Fill out the Warranty Registration Form in this section, keep a copy for your
records and mail form to:
Ingersoll-Rand Company
Portable Compressor Division
P.O. Box 668
Mocksville, North Carolina 27028
Attn: Warranty Department
Note: Completion of this form validates the warranty.
Engine Registration:
No engine registration required. Must present Proof of Purchase whenever engine
warranty service is required.

Book 43212455 (11/03)
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Warranty Registration Form
Completion of this form validates the warranty
Selling Distributor Servicing Distributor WARRANTY REGISTRATION
Name Name Owner/User Name
Address Address Address
City City City
County County County
State State State
Zip Code Zip Code Zip Code
Telephone Telephone Telephone
Complete the Applicable Blocks
Owner/User Type of Business (check one only)
Construction-Heavy Asphalt Contractor Coal Mining Other Mining
(highway, excavation, etc.)
Construction-Light Government Quarry Shallow Oil & Gas
(carpentry, plumbing, pools (municipal, state,
mason, etc.) county, etc.)
Rental Building Contractor Waterwell Utility Company
(rental center, (gas, electric, water, etc.)
rental fleet, etc.)
Industrial (plant use) Other Exploration Utility Contractor
specify
Model Unit S/N Engine S/N Date Delivered
Unit-Hours Airend S/N Truck S/N Truck Engine S/N
SERVICING DISTRIBUTOR/USER ACKNOWLEDGMENT
1 The Purchaser has been instructed and/or has read the manual and understands proper preventative
maintenance, general operation and safety precautions.
2. The warranty and limitation of liability has been reviewed and understood by the owner/user.
3. In the event that this unit is to be used within a nuclear facility, the owner/user shall notify Ingersoll-Rand of
such use so that Ingersoll-Rand may arrange for appropriate nuclear liability protection from the owner-
licensee of the facility.
4 Ingersoll-Rand reserves the right to make design changes or modifications of Ingersoll-Rand products at
anytime without incurring any obligation to make similar changes or modifications on previously sold units.
I hereby acknowledge acceptance of above.
Owner/User Date
I hereby certify that the above is accurate and complete.
Distributor/I-R Rep. Date

Book 43212455 (11/03)
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- - - - - - - - - - - - - - - - - - - - - fold - - - - - - - - - - - - - - - - - -

Book 43212455 (11/03)
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SECTION 4 – SYSTEM DESCRIPTION
General
The CMH air compressors are semi-packaged, air cooled units designed for power take-off applications.
Each unit is designed to operate at ambient temperatures from - 10°F to 125°F (-23.3°C to 51.7°C). For
the actual delivery of each unit at its rated operating pressure, refer to the typical General Data Decal
supplied with each unit, and to the table in Section 5.
The unit includes an oil flooded, rotary, screw-type air compressor, a compressor inlet system, a capacity
control system, a compressor lubricating oil system, a compressor discharge system as well as basic
instrumentation. The compressor inlet system includes an air intake cleaner with a service indicator. The
capacity control system includes a pressure regulator linked to a compressor inlet unloader valve. The
compressor lubricating oil system includes an air-cooled type oil cooler, an oil filter, and oil control valve
and an oil separator tank and air receiver. The oil cooler is of the fin and tube-type construction that
requires forced draft cooling air. Basic instrumentation includes compressor discharge air pressure and
temperature gauges, and air cleaner restriction indicator.
The enclosure cabinet, in which most of the components are mounted, is of heavy gauge sheet steel and
is equipped with easy opening access panels for performing routine maintenance functions. Most routine
service can be performed without removing any panels.
Compression in the screw-type air compressor is created by the meshing of two sets of helical rotors
(male and female) on parallel shafts enclosed in a heavy-duty cast iron housing with air inlet and outlet
ports located at opposite ends. The male rotor has four lobes, 90 degrees apart and the female rotor has
six grooves 60 degrees apart. The grooves of the female rotor mesh with and are driven by the male
rotor. Thrust taper roller bearings at the rear of the air end prevent longitudinal movement of the rotors.
As rotation of the compressor occurs, the rotors unmesh and free air is drawn into the cavities or pockets
between the male rotor lobes and the grooves of the female rotor. The air is trapped in these pockets and
follows the direction of rotation of each rotor. As soon as the inlet port is closed, the compression cycle
begins and the trapped air is directed to the opposite or discharge side of the rotor housing. As the rotors
mesh, the normal free volume of air is decreased and the pressure increased until the closing pocket
reaches the discharge port. Cooled lubricating oil is admitted to the compressor by being injected, in
metered amounts, directly into the rotor housing so that it passes on with the air being compressed. This
removes the heat of compression to a large degree and results in a relatively low, final discharge air
temperature.
Since the CMH Series compressor is of the positive displacement type, an air flow control system must be
provided to regulate the volume of air passing through the compressor to match the amount of service air
required by the customer.
Constant speed control unloads the compressor at a predetermined pressure while the driving unit
continues to operate at full speed. This is accomplished by an air operated regulator closing off the intake
to the compressor in an infinitely variable or stepless manner through the inlet unloader valve.
The discharge air pressure can be controlled between 77 and 200 psig (531 to 1379 kPa) by simple
readjustment of the speed and pressure regulator adjusting screw.

Book 43212455 (11/03)
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SECTION 5 - INSTALLATION
Location
After the type of drive is determined, satisfactory installation depends upon the ability of the installer.
Refer to the appropriate foundation plan for the dimensions of the compressor package and the
appropriate separator foundation plan for the dimensions of the combination primary oil separator tank-
air receiver and the secondary separator tank (hereafter called the receiver separator).
Choose a clean, relatively cool location for the compressor package, and provide ample space around the
unit for general accessibility and to ensure effective heat dissipation. Extreme care must be taken in
locating an air-cooled unit of this type so there is an unrestricted supply of air to the cooling fan, which
pulls air over the oil cooler core. The fan discharge air must flow away from the unit so that it may be
readily dissipated to atmosphere without recirculating hot air to the fan intake. Any recirculation of the
cooling air may result in an excessively high compressor operating temperature. The compressor
package must be located so the compressor discharge temperature gauge and the air cleaner service
indicator will be fully visible. Included with the compressor package is a compressor discharge pressure
gauge and a discharge temperature gauge.
For the installation of the receiver separator, choose a location that is on the same level as or lower than
the compressor package. Ample space must be provided around the receiver to ensure the proper
installation of all piping connections. In addition, the receiver separator must be located so that the
separator element may be removed for inspection and service. Refer to the appropriate separator
foundation plan.
A condensate drain valve is factory supplied with the receiver separator. When installing the receiver
separator, provision should be made for easy access to this drain valve as it will be necessary to drain the
condensate daily before starting the unit.
NOTE
The condensate drain valve and line must
be located as the lowest point in the
lubricating and cooling oil system for proper
condensate removal.
The valve may also be used as a service valve for draining the lubricating and cooling oil at periodic
change intervals.
Exact level is not absolutely necessary, but it is recommended the unit be leveled with a sight glass or a
carpenter’s level set on the compressor housing. Leveling may be accomplished by shimming the unit
near the unit’s bolting holes. Be sure to use steel shims. Mounting holes are provided on the bottom of
the base and weld nuts are provided on the sides of the frame. Either may be used for mounting.
Inlet Piping
Each unit is supplied with standard air cleaners to protect the compressor from normal air-borne dust and
dirt. If necessary, the air cleaners may be removed and remotely mounted for ease in accessibility.

Book 43212455 (11/03)
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PIPING
General
As CMH Series compressors are comprised of two modules (compressor and separator), there is
necessarily interconnecting piping between the two. These hoses are not provided with the units, as the
required lengths of the hoses are dependent on the relative location of the two modules in their installed
location. It is left to the installer to obtain hoses of the correct type and length for each installation.
The following hoses will be needed:
LOCATION SIZE HOSE TYPE
Compressor Module to Oil Temp
Bypass Valve Outlet (Filter)
-12 JIC Parker-Hannifin 213, or
Aeroquip FC350, or equivalent
Compressor Module to Hydraulic
Supply
-12 JIC Parker-Hannifin 301 or equivalent
Compressor Module to Hydraulic
Return
-12 JIC Parker-Hannifin 301 or equivalent
Compressor Module to Case
Drain Return
-6 JIC Parker-Hannifin 213, or Aeroquip
FC350, or equivalent
Compressor Module to Separator
Scavenge
-4 JIC Parker-Hannifin 213, or Aeroquip
FC350, or equivalent
Compressor Module to Air
Pressure Regulator Outlet
-6 JIC Parker-Hannifin 213, or Aeroquip
FC350, or equivalent
Compressor Module to Separator
Discharge
-6 JIC Parker-Hannifin 213, or Aeroquip
FC350, or equivalent
Compressor Module to Oil Cooler
Drain
-6 JIC Parker-Hannifin 213, or Aeroquip
FC350, or equivalent
Oil Cooler to Oil Temp Bypass
Valve Port “B”
-24 JIC Parker-Hannifin 206, or Aeroquip
FC300, or equivalent
Oil Cooler to Oil Temp Bypass
Valve Port “C”
-24 JIC Parker-Hannifin 206, or Aeroquip
FC300, or equivalent
Airend Discharge to
Receiver/Separator Inlet
-32 JIC Parker-Hannifin 206, or Aeroquip
FC300, or equivalent
NOTES:
1. All hoses terminate at marked bulkhead fittings on drive end of machine, except oil cooler
connections, which are on the cooler side of the compressor module.
2. All hoses terminate in Type I (SAE J516 female swivel straight), 37°JIC flare fittings on each end.
3. Ports “B” and “C” on oil temperature bypass valve can be connected to either port on the oil cooler.
Oil cooler performance is not sensitive to flow direction.
4. 2 inch NPT to –32 JIC adapter and fitting for airend discharge pipe is customer supplied.
Compressor Discharge Piping
The connection between the compressor package and the receiver separator must be furnished by the
customer. It is recommended the customer use a flexible line with an inside diameter of the same size, or
larger than the compressor package discharge connection. All piping must be certified safe for the
pressures and temperatures involved.

Book 43212455 (11/03)
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Receiver separator Discharge Piping
The receiver separator discharge piping must be furnished by the customer. Refer to the appropriate
separator fitting location for a typical piping arrangement for these units. A minimum pressure valve and a
manual shut-off valve is supplied with each unit and must be piped into the customer’s system as
indicated. The minimum pressure valve is supplied to maintain approximately 77 pisg (531 kPa) in the air
receiver tank to ensure proper oil circulation and also to prevent excessive oil carryover into the
customer’s air service system. The manual shut-off valve must be installed between the minimum
pressure valve and the customer’s air service system to serve as an isolation valve.
In addition, whenever this unit is connected to a high volume customer’s service air system, a terminal
check valve must also be installed downstream of the minimum pressure valve and the isolation valve to
prevent air from the system from bleeding back into the compressor system on shutdown.
Wiring
The compressor is protected against overheating by a thermal-type discharge air temperature switch
located in the compressor discharge piping. A “normally-closed” type thermal switch, factory set at 248°F
(120°C), is supplied as standard equipment on these units. This switch is supplied for 12/24 volt DC. As
an option, this switch may be supplied for 125 volt AC. A thermal sensor switch, also set at 248°F
(120°C), normally closed, is provided as extra protection in the receiver separator. It is to be wired in
series with the airend temperature switch by the user. This switch is supplied for 12/24 volts DC, with
optional AC switches available as an option.
Driver
The installation of a CMH Series Compressor with any drive such as a power take-off drive or a hydraulic
motor drive is very flexible. The proper rotation of the compressor is clockwise when viewed from the
driver end.
NOTE
Because the compressor is of the axial screw type, the rotation cannot
bchanged.
MODELS CAPACITY TORQUE REQUIRED POWER REQUIRED INPUT
CFM M3/MIN. POUND – FEET N.M BHP KILOWATTS RPM
VHP400CMH 400 11.3 454 616 147 110 1700
VHP500CMH 500 14.2 460 624 184 137 2100
VHP550CMH 550 15.6 483 654 193 144 2100
VHP550CMH 550 15.6 441 598 193 144 2300
HP600CMH 600 17.0 413 560 181 135 2300
XP650CMH 650 18.4 376 510 179 133 2500
This unit is normally driven by a hydraulic motor directly mounted to the SAE adapter attached to the
airend. The standard interface is for 1.75”, 13 tooth, 8-16 DP/30°splined shaft. Mounting flange is SAE
“D”. Alternatively, SAE “C” is available.

Book 43212455 (11/03)
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A drive shaft from the source of power take-off can alternatively be used to drive the compressor. It is
extremely important that the angularity of the drive shaft, including the universal joints, be within the limits
specified by the manufacturer. The power take-off shaft and the compressor rotor drive shaft must always
be parallel. This gives the same angle at each universal joint and prevents excessive wear. The forks of
the universal joint on the drive end must be installed parallel to the forks on the driven and universal.
There are many types of universal joints that can be used. However, a constant velocity universal joint as
previously described will reduce the possibility of torsional vibration. If a slip joint or spline is used on the
drive system, it should be placed between the two universal joints for best results.
Regulation
The standard regulation system supplied with CMH Series Compressors is designed to provide capacity
control for the compressor only. Variable speed control of a driver engine is possible with additional
equipment. Consult Ingersoll-Rand Company, Specialty Products Department for technical assistance for
these applications.
The adjustment and operation of the standard regulation system is described in Section 6, Operating
Instructions.

Book 43212455 (11/03)
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SECTION 6 - OPERATING INSTRUCTIONS
SETTING-UP
• Place the unit in an open, well-ventilated
area. Position as level as possible. The
design of these units permits a 15 degree
limit on out-of-level operation.
• When the unit is to be operated out-of-
level, it is important to have the compressor
oil level gauge show no more than mid-scale
(with the unit running at full load). Do not
overfill either the engine crankcase or the
compressor lubricating oil system.
PROCEDURE FOR AIREND OIL PRIMING
(TO BE PERFORMED PRIOR TO INITIAL START-UP)
AIREND SIZE QUANTITY OF OIL INJECTED
(GALLONS/LITERS)
METHOD A METHOD B
85MM 0.5 / 2 1.0 / 4
CF75 0.5 / 2 1.0 / 4
100MM 0.5 / 2 1.0 / 4
CF90 0.5 / 2 1.0 / 4
127.5MM 0.5 / 2 1.0 / 4
178.5MM 1.0 / 4 2.0 / 8
226MM 1.8 / 7 3.6 / 14
285MM 3.0 / 11 6.0 / 23
350MM 4.0 / 15 8.0 / 30
Notes:
1. All airends are to be primed with oil before
the first start of the unit. The prime oil
quantity is part of the total fill quantity of the
unit.
The priming of single stage airends can be
done by either of the two following methods:
A) Disconnect main oil supply hose that
goes from the oil filter outlet to the airend
and inject oil directly into this hose to the
airend.
B) Disconnect the separator tank scavenge
hose that leads to the oil filter and inject
oil into the filter.
2. The chart shows minimum fill requirements.
3. –HR2: Disconnect the hose going to the seal
and inject 7 gallons (26L) into the manifold
tubing.
--HR2.5: Remove cap on manifold tube
between pump and filter and inject 7 gallons
(26L) into the manifold tubing.
BEFORE STARTING
Do not connect the air discharge on this unit into a
common header with any other unit of any
description, or any other source of compressed air,
without first making sure a check valve is used
between the header and the unit. If this unit is
connected in parallel with another unit of higher
discharge pressure and capacity, a safety hazard
could occur in a back-flow condition.
Safety valve setting is 250 psig (1724 kPa).
Assure external air system is safe under all
operating conditions to prevent serious hazard to
operations personnel.
Unrestricted air flow from a hose will result in a
whipping motion of the hose which can cause
severe injury or death. A safety device must
be attached to the hose at the source of supply
to reduce pressure in case of hose failure or
other sudden pressure release. Reference:
OSHA regulation 29 CFR Section 1926.302 (b).
• Open manual blow-down valve to ensure
pressure is relieved in receiver separator
system. Close valve in order to build up full
air pressure and ensure proper oil circulation.
• Check the compressor lubricating oil
level. The proper oil level is mid-way on the
sight gauge. Add oil if the level falls to the
bottom of the sight gauge. Do not overfill.
This machine produces loud noise. Extended
exposure to loud noise can cause hearing loss.
Wear hearing protection when valve(s) are
open.
Always operate this equipment with all enclosure
panels installed to avoid recirculation of hot air.
CAUTION
WARNING
WARNING