This Wabco air compressors service manual (RENR2314) provides complete specifications, systems operation theory, troubleshooting procedures, and cylinder head disassembly/assembly instructions for the 250 cc and 318 cc single-cylinder air compressors installed on Caterpillar 3126B and 3126E diesel engines. Published by Caterpillar in July 2001, the 24-page PDF is intended for technicians servicing truck air brake charging systems.
Official Wabco air compressors service manual document details
| Brand | Caterpillar (CAT) |
| Model coverage | 3126B & 3126E engines — serial prefixes BKD1, CPD1, 6ZG1, CKM1, CRP1, 9SZ1 |
| System / Group | Wabco 250 cc and 318 cc Air Compressors (SMCS 1803 / 1804) |
| Publication no. | RENR2314-00 |
| Year / Revision | July 2001 |
| Pages | 24 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- Specifications Section — weights, bore sizes, stroke, displacement at 1250 rpm, maximum discharge pressures
- Air Compressor Maintenance Procedures — service tests, operating tests per FMVSS 121
- Systems Operation — General Information, Air Induction, Cooling, Lubrication, Operation
- Compression of Air (Loaded) — intake and compression stroke detail with illustrations
- No Compression of Air (Unloaded) — governor-controlled unloading mechanism
- Troubleshooting — Air Compressor Cycles Constantly, Fails to Unload, Noisy Operation, Coolant Leaks, Oil Leaks, Cylinder Head Gasket Failure, Excessive Build-Up and Recover Time, Excessive Oil at Exhaust Ports or Air Strainer
- Disassembly and Assembly — Cylinder Head Remove and Install (service kit referenced)
- Index
Applicable truck models
RENR2314 applies to any vehicle or machine equipped with a Caterpillar 3126B or 3126E engine using a Wabco 250 cc or 318 cc single-cylinder air compressor. Key specifications documented include a bore of 75.0 mm (250 cc) or 85.0 mm (318 cc), a common stroke of 55.9 mm, a maximum recommended speed of 3000 RPM, and maximum continuous discharge pressures of 1000 kPa / 145 psi (250 cc) or 1034 kPa / 150 psi (318 cc). The manual also references FMVSS 121 air brake performance standards requiring pressure recovery from 586 kPa to 689 kPa in under 25 seconds. Minimum coolant flow rates are specified as 6 L/min (250 cc at 2400 RPM) and 8 L/min (318 cc at 2400 RPM). For additional Caterpillar parts and technical resources, visit Caterpillar’s official website.
Who needs this Wabco air compressors service manual
Fleet mechanics, independent repair shops, and workshop owners maintaining trucks with CAT 3126B or 3126E engines will use this manual to diagnose slow air-pressure build-up, compressor oil or coolant leaks, constant cycling, noisy operation, and cylinder head gasket failures. The troubleshooting trees and torque specifications make it essential for any brake-system air supply repair.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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