Class Code 3612
Pump/Hydraulic Apparatus Mfg Or Repair
Class code 3612 covers California employers who manufacture, overhaul, test or repair pumps and hydraulic apparatus. The approved pure premium rate is $3.357 per $100 of payroll, which matters because the class determines baseline workers' comp cost and regulatory safety focus for shops and field service crews.
What Class Code 3612 Covers
This classification applies to operations that fabricate, assemble, remanufacture, repair or bench-test pumps, hydraulic pumps, power units, valves, hydraulic manifolds and related apparatus. It includes in-shop machining, welding, brazing, pressure and leak testing of hydraulic systems, rebuilding pump assemblies, replacing seals and bearings, and diagnostic troubleshooting. Mobile repair work performed at customer sites — such as replacing pumps, installing hydraulic power units, or on-site pressure testing — is included when those employees are paid by the employer under the same operation. It does not broadly cover unrelated installation trades (electrical or plumbing contractors) unless the employer's primary business is pump or hydraulic apparatus manufacture/repair.
Who It Applies To
- Pump and hydraulic-pump manufacturing companies (OEMs and remanufacturers)
- Independent pump repair and remanufacturing shops
- Mobile pump/hydraulic service fleets performing on-site repairs and testing
- Industrial maintenance shops specializing in hydraulic power units and valves
- Vendors that rework, rebuild or bench-test centrifugal and positive-displacement pumps
- Companies that assemble hydraulic manifolds, cylinders and associated power units
Common Job Duties
- Disassembly, cleaning and inspection of pumps, seals, bearings and housings
- Precision machining and resurfacing (lathes, mills, grinders) of pump components
- Welding, brazing and metal fabrication to repair casings and shafts
- Hydraulic and pressure bench testing, leak testing and system commissioning
- Diagnosing hydraulic systems, replacing valves, seals and cartridges
- Lifting and rigging heavy pumps and power units using hoists, cranes or forklifts
Common Injury Risks
Understanding the $3.357 Rate
The approved pure premium rate of $3.357 per $100 of payroll represents the expected loss cost for claims in this class before insurer adjustments. Insurers multiply this pure premium by their loss cost multipliers and apply an employer's experience modification, payroll audits, state assessments and any policy-level adjustments to determine the final premium. Controlling claims frequency and severity, accurate payroll classification, and safety programs all influence the premium you actually pay.
Cal/OSHA Compliance Requirements
Key Cal/OSHA areas for pump and hydraulic repair shops include machine guarding for lathes and mills, control of hazardous energy (lockout/tagout) for rotating equipment, and pressure vessel and hydraulic-line safety during pressure testing. Employers must comply with Title 8 requirements for welding/cutting, hazard communication for hydraulic fluids and solvents, PPE (eye, face, hand protection), and noise monitoring where machining generates high dB levels. Written procedures and training for pressure testing and confined-space entry for tanks or large reservoirs are often required.
How Key HR Helps Employers Under Class Code 3612
A PEO like Key HR helps employers in this classification by centralizing workers' comp purchasing, managing claims and return-to-work programs, and delivering targeted safety and training programs (pressure-testing protocols, lockout/tagout, welding safety). Key HR can assist with classification audits, experience-mod reviews, on-site or virtual Cal/OSHA training, and coordinated incident investigation to reduce repeat losses and control premium growth.
Get a QuoteFrequently Asked Questions
Do mobile field technicians who repair pumps at customer sites fall under class code 3612?
Yes, employees whose primary work is manufacturing, rebuilding or repairing pumps and hydraulic apparatus—whether in a shop or at customer sites—are normally classed to 3612. Payroll for mobile crews should be reported to this class; travel time and vehicle operations may require separate reporting depending on policy rules.
What specific steps reduce the risk of high‑pressure fluid injection injuries?
Implement written pressure-testing procedures, use pressure-relief and isolation devices, inspect hoses and fittings before each use, require punch‑proof insulated tools and PPE, and train technicians to never use hands to check leaks. Immediate medical evaluation is required for suspected injection injuries.
How can my shop lower its workers' comp costs under this class code?
Documented safety programs (lockout/tagout, welding safety, ergonomic lifting aids), routine maintenance of hoses/fittings, timely drug-testing and post-injury return-to-work plans, and prompt, proactive claims management to limit indemnity days all reduce loss costs. A PEO like Key HR can also help ensure correct payroll classification and contest misclassifications that inflate premiums.
Quick Facts
- Class Code
- 3612
- Classification
- Pump/Hydraulic Apparatus Mfg Or Repair
- Pure Premium Rate
- $3.357 / $100 payroll
- Effective Date
- September 1, 2026
- Source
- WCIRB Approved Filing
Manage Workers' Comp Through a PEO
Key HR provides pay-as-you-go workers' comp for California employers — no large deposits, no audits, better rates.
Get a Quoteor call (800) 922-4133Ready to Simplify Workers' Comp for Class Code 3612?
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