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  • July 26, 2026

Cast Iron NMRV Gearbox Installation & Maintenance – Complete Guide

H1: Cast Iron NMRV Gearbox – Installation & Maintenance Guide

Installation Checklist

Before mounting:

  • Ensure mounting position (M1-M6) is specified – cast iron units require oil quantity adjustment by position

  • Verify input/output shaft alignment – misalignment causes premature bearing failure

  • Mount on flat, rigid base with all bolts tightened

During mounting:

  • For sizes 110-150: oil quantity depends on mounting position – specify when ordering

  • Use correct B5 or B14 flange for motor mounting

  • Breather plug must face upward regardless of position

NMRV gearbox lubrication table：

ParameterSpecification
Recommended oilISO VG 320 or VG 460 synthetic worm gear oil
First changeAfter 150-400 hours of operation
Regular changeEvery 6-12 months

Daily Checks:

  • Check oil level – maintain at sight glass midpoint

  • Listen for unusual noise – early warning of wear

  • Check for oil leaks at seals

FAQ

Q: Why is mounting position critical for cast iron NMRV?
A: Cast iron units (110-150) are filled with oil based on the specified mounting position. Wrong position = incorrect oil level = oil starvation and severe damage

Q: What oil should I use?
A: ISO VG 320 or VG 460 synthetic worm gear oil. Synthetic is recommended due to worm gear sliding friction.

Q: How often should I change the oil?
A: First change at 150-400 hours, then every 6-12 months depending on duty cycle

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