QRNG 350
Quincy Compressor
50163-104, February 2008
1
3501 Wismann Lane, Quincy IL - 62305-3116
INTRODUCTION
This manual provides information for the QRNG
Series, Model QRNG 350 natural gas compressor per
Record of Change 104.
The Model QRNG 350 natural gas compressor is
an aircooled, two stage, two cylinder, pressure lubri-
cated compressor capable of handling inlet pressures
of -.75 PSIG (15 in. mercury) up to 30 PSIG. A
maximum of 400 PSIG discharge pressure can be
produced (with proper controls and modifications). It
has a 6" low pressure bore, a 3.25" high pressure bore
x 3.50" stroke and can be run at 400-900 RPM.
TABLE OF CONTENTS
Ordering Replacement Parts ................................ 1
Serial Number Identification ................................. 1
Crankshaft Group .................................................. 2
Crankcase Group ................................................... 3
Bearing Carrier Group ........................................ 4-5
Connecting Rod & Piston Groups
low pressure .................................................... 6-7
high pressure .................................................. 8-9
Cylinder & Head Groups ............................... 10-11
Head Assemblies ............................................ 12-13
Suction Valve Assembly ..................................... 14
Discharge Valve Assembly ................................. 15
Pneumatic Unloader Assembly .......................... 16
Control Group ...................................................... 17
Recommended Spare Parts ................................ 18
Gasket Set ............................................................ 18
Quin-Cip Lubricant .............................................. 18
"O" Ring Kit ......................................................... 18
Decals ................................................................... 18
Crankcase Lubricant Capacity ........................... 18
ORDERING
REPLACEMENT PARTS
All replacement parts are to be ordered through an
authorized Quincy gas application distributor.
Insist
on genuine Quincy parts only! Failure to do so
may void warranty.
Prompt service can be rendered on repair parts orders
if the following information is given:
MODEL &
SERIAL NUMBER
IDENTIFICATION
Model & Serial Number
Identification Tag
Record
of
Change No.
The serial number identification tag is located on the
handhole plate side of the crankcase.
Fill in the
numbers from compressor in the corresponding spaces
provided here, and reference this page when ordering
replacement parts.
CHANGES
since previous printing dated December, 2007:
Head unloader piping was modified.
Follow all safety precautions outlined in the QRNG Series
instruction manual.
Do not operate this compressor without a totally enclosed
belt guard or any other required safety equipment.
Air used for breathing or food processing must meet OSHA
1910.134 or FDA 21 CFR 178.3570 regulations. Failure to do
so may cause severe injury or death.
DANGER !
CAUTION !
WARNING !
Item 1)
the model number, record of change num-
ber, & serial number.
Item 2)
the exact part number needed. (Do not
order by item numbers.)
Item 3)
the exact quantity needed.
Item 4)
the preferred type of transportation.
