Udor S160 Diaphragm Pump Reduction Gearbox

The Udor S160 is a heavy-duty reduction gearbox engineered for coupling petrol and diesel engines to Udor diaphragm pumps. With a robust 6:1 gear reduction ratio, the S160 converts high engine RPM to the optimal pump operating speed, protecting pump components and ensuring consistent spray performance. Available with 20mm, 3/4-inch, and 23mm conical engine shaft options, the S160 provides flexible mounting for a wide range of small engines up to 6.5 HP. Purpose-built for agricultural spraying, lawn care, pest control, and portable pumping applications across New Zealand.

Specifications

Model	Udor S160
Type	Reduction Gearbox (Gear Case)
Gear Ratio	6:1
Maximum Engine Power	6.5 HP (4.8 kW)
Engine Shaft Options	20mm keyed, 3/4″ (19.05mm) keyed, 23mm conical
Oil Type	90W gear lube
Oil Capacity	Approx. 0.47 L (16 oz)
Weight	Approx. 3.6 kg (8 lbs)
Udor USA Part Numbers	5027.75 (3/4″ shaft), 5071.75 (3/4″ GR shaft)

S160 Gearbox Variants

511375	S160-20VAZ — 20mm shaft, HP 6.5, D.20
507575	S160-20GR — 20mm shaft, HP 6.5, D.20
506975	S160-20VA — 20mm shaft, HP 6.5, D.20
507175	S160-3/4″GR — 3/4″ shaft, HP 5.5, D.3/4″
502775	S160-3/4″VA — 3/4″ shaft, HP 5.5, D.3/4″
508275	S160-3/4″VAZ — 3/4″ shaft, HP 5.5, D.3/4″
5081F6	S160-GRC — 23mm conical, HP 5.5
5106G4	S160-VAC — 23mm conical, HP 5.5

Compatible Pumps

The S160 gearbox is designed to mate directly with the following Udor diaphragm pump series:

• ZETA-P Series: ZETA-P 42, ZETA-P 70, ZETA-P 85, ZETA-P 100
• ZETA Series: ZETA 85, ZETA 100, ZETA 120
• ZETA-PP Series: ZETA-PP 42, ZETA-PP 70
• KAPPA Series: KAPPA 33, KAPPA 43, KAPPA 53, KAPPA 55, KAPPA 65
• DELTA Series: DELTA 40, DELTA 50, DELTA 75, DELTA 100

Applications

• Agricultural crop spraying and orchard treatment
• Lawn care and turf management spraying systems
• Pest control and weed management rigs
• Portable engine-driven spray units
• Vineyard and horticultural spraying
• Livestock wash-down and farm sanitation

Key Features

• 6:1 reduction ratio converts engine speed to safe pump operating RPM
• Robust aluminium alloy gear case for lightweight durability
• Multiple engine shaft options (20mm, 3/4″, 23mm conical) suit Honda, Briggs & Stratton, Kohler, and other popular small engines
• Direct bolt-on mounting to compatible Udor diaphragm pumps — no adapter plates needed
• Sealed gear case with sight glass for easy oil level monitoring
• Hardened steel helical gears for smooth, quiet operation and long service life
• Designed and manufactured by Udor S.p.A. in Italy

Technical Documents

• Udor S160 Exploded Parts View (PDF)
• Udor S160 Gear Reduction Product Sheet (PDF)
• All Udor S160 Documents

Parts & Service

AES Waterblasters is the sole authorised Udor distributor in New Zealand. We carry genuine Udor S160 gearbox components including gear case halves, bearings, seals, input shafts, and hardware. All parts are sourced directly from Udor Italy to ensure correct fit and reliable performance. Contact us on 09 271 4782 or email sales@waterblasters.co.nz for pricing, availability, and technical support.