QR-25 Series Model 370 Parts Manual Record of Change 107 - Safety and Parts Ordering Guide

Nov 4, 2026

QR-25 Series Model 370 compressor parts manual (Record of Change 107) provides safety information and maintenance-related guidance for installation, operation, and service personnel. It covers required model, serial number, and change record identification for ordering replacement parts through authorized Quincy distributors, emphasizing genuine parts to protect warranty. The manual describes applicable control versions (L, LS, LVD), key technical specifications, lubricant selection and crankcase capacity, warning and caution requirements, and a structured parts catalog with component group references.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages28

Reading Time1 h 11 min

AccessFree to download

INTRODUCTION

CHANGES

TABLE OF CONTENTS

Serial Number Identification

Ordering Replacement Parts

Quin-Cip Lubricant

Crankcase Lubricant Capacity

Crankshaft Group

Crankcase Group

Bearing Carrier Group

Connecting Rod & Piston Groups (High pressure / Low pressure)

Cylinder & Head Groups (Control Versions L, LS, LVD)

Head Assemblies (Control Versions L, LS, LVD)

Suction Valve Assembly

Discharge Valve Assembly

Unloader Assembly

Pneumatic Unloader Assembly

Control Groups (Version L / Version LS / Version LVD)

Pilot Valves

Differential Setting Chart

Suction Valve Unloader Assemblies

Gasket Set

Kits

Recommended Spare Parts

Decals

Typical Unit Parts List

® QR-25 Series Model 370 Parts Manual Record of Change 107 This manual contains important safety information and must be carefully read in its entirety and understood prior to installation by all personnel who install, operate and/or maintain this product. On-line product registration, parts ordering and warranty information is available at www.quincycompressor.com Manual No. 2022205800 July 2014 Edition INTRODUCTION This manual provides information for the following QR-25 Series, Model 370 (Record of Change 107) compressor versions: L Control Version L head assembly with 2 unloader towers & a hydraulic unloader LS Control Version LS head assembly with 2 unloader towers, a hydraulic unloader, & a pilot valve with a check valve assembly LVD Control Version LVD head assembly with 2 unloader towers, a hydraulic unloader, & a pilot valve with a lockout & check valve These compressors are aircooled, two stage, two cylinder, pressure lubricated compressors, with up to 200 PSIG continuous pressure capability (201 to 250 PSIG intermittant pressure capability with proper configuration;consult factory) . The Model 370 has a 6" low pressure piston bore and a 3.25" high pressure piston bore and a 4" stroke and can be run at 400-1070 RPM. Available options included in this manual: -high pressure rated cylinder and head -hooded air filter -hooded air filter / silencer CHANGES since previous printing (dated January 2014): The bearing carrier was redesigned with a new oil pump including an oil filter. TABLE OF CONTENTS Serial Number Identification..................................2 Ordering Replacement Parts .................................2 Quin-Cip Lubricant .................................................2 Crankcase Lubricant Capacity ..............................2 Crankshaft Group ...................................................3 Crankcase Group....................................................4 Bearing Carrier Group............................................5 Connecting Rod & Piston Groups high pressure ...................................................6-7 low pressure .....................................................8-9 Cylinder & Head Groups Control Versions L, LS, LVD............................. 10 Head Assemblies Control Versions L, LS, LVD............................. 11 Suction Valve Assembly ...................................... 12 Discharge Valve Assembly .................................. 13 Unloader Assembly .............................................. 14 Pneumatic Unloader Assembly........................... 15 Control Groups Version L ............................................................ 16 Version LS.......................................................... 17 Version LVD ....................................................... 18 Pilot Valves............................................................ 19 Differential Setting Chart ..................................... 19 Suction Valve Unloader Assemblies...................20 Gasket Set .............................................................21 Kits.........................................................................21 Recommended Spare Parts.................................22 Decals ....................................................................22 Typical Unit Parts List ..........................................23 QR 370 Quincy Compressor MODEL & SERIAL NUMBER IDENTIFICATION Recoofrd Change No. Model & Serial Number Identification Tag The model & serial number tag is located on the handhole plate side of the crankcase. Fill in the numbers from your compressor's tag in the corresponding spaces provided here and reference this page when ordering replacement parts. All replacement parts are to be ordered through an authorized Quincy distributor. Insist on genuine Quincy parts only! Failure todo so may void warranty. ORDE

FAQs

Where is the model and serial number identification tag located, and what should be recorded?

The identification tag is located on the handhole plate side of the crankcase. Fill in the model and serial number numbers from the compressor’s tag and reference the page when ordering replacement parts.

How should replacement parts be ordered for the QR-25 Series Model 370?

Replacement parts must be ordered through an authorized Quincy distributor. Provide the model number, record of change number, serial number, the exact part number (do not order by item numbers), and the exact quantity needed.

What safety, lubrication, and operational cautions are emphasized?

Do not operate the compressor without the totally belt guard or other required safety equipment. Refer to the Quincy QR-25 Series instruction manual for vital lubrication information, and ensure air used for breathing or food processing meets OSHA 1910.134 or FDA 21 CFR 178.3570 requirements.

Nov 4, 2026

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