{"product_id":"prm-90d-drop-centre-marine-gearbox-ahead-ratio-2-04-1-prm-90d2","title":"PRM 90D Drop Centre Marine Gearbox (Ahead Ratio 2.04:1)","description":"\u003cp\u003eSimple mechanical operation, lightweight, compact \u0026amp; rugged.\u003c\/p\u003e\u003cp\u003eThe PRM90 gearbox is designed for use in pleasure craft where a simple lightweight transmission is required.\u003c\/p\u003e\u003cp\u003eThe cone clutches for both ahead and astern are mechanically operated and require no adjustment.\u003c\/p\u003e\u003cp\u003eThe gearbox is purpose built to operate with standard rotation engines i.e. providing a clockwise rotation of the gearbox input shaft when viewed on input. In forward drive the output shaft rotates opposite to input shaft therefore requiring a right hand propeller.\u003c\/p\u003e\u003cp\u003eThe reduction ratios offered are 2.04:1 and 2.50:1 with a common astern ratio of 2.5:1\u003c\/p\u003e\u003cp\u003eThe heavy duty aluminium gearcase is externally ribbed for strength and heat dissipation and therefore requires no oil cooler.\u003c\/p\u003e\u003cp\u003eDirection actuation is by a lever with positive detent positions for ahead, neutral and astern. It is suitable for use with proprietary remote control operating systems which must be of the single lever dual action type.\u003c\/p\u003e\u003cp\u003eIt is essential for the engine, transmission model, reduction ratio and propeller size to be correctly matched so that the engine can attain its rated speed appropriate to the relevant service classification without labouring.\u003c\/p\u003e\u003cp\u003eIt is also necessary to ensure the torsional compatibility of the complete propulsion system from engine through to propeller, since disregarding this may result in gear noise, particularly at low speed operation, and may even result in damage to the engine as well as the transmission components.\u003c\/p\u003e\u003cp\u003eOil Cooling\u003c\/p\u003e\u003cp\u003eThe normal operating temperature should be in the range 50°C to 95°C using a good quality Automatic Transmission Fluid.\u003c\/p\u003e\u003cp\u003ePropeller Free Wheeling\u003c\/p\u003e\u003cp\u003eThe PRM90 output shaft can be rotated continuously with the gearbox in neutral. It is therefore not necessary to fit a propshaft brake when running with the engine shut down, for example when sailing.\u003c\/p\u003e\u003cp\u003ePRM90 Gearbox spline: 10 teeth B10 x 23 x 29mm DIN 5464. PRM 90 Gearbox coupling: 4\", 4 holes, 3¼\" PCD, 2½\" female register. Oil Capacity: 0.3 litres (0.5 pint).\u003c\/p\u003e\u003cdiv class=\"panel-body\"\u003e\n                            \u003ctable class=\"table\"\u003e\n                                \u003ctbody\u003e\n                                                                    \u003ctr\u003e\n                                        \u003ctd\u003e\u003cstrong\u003eCapacity Description\u003c\/strong\u003e\u003c\/td\u003e\n                                        \u003ctd\u003eOil Capacity: 0.3 Litres (0.5 pint)\u003c\/td\u003e\n                                    \u003c\/tr\u003e\n                                                                    \u003ctr\u003e\n                                        \u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n                                        \u003ctd\u003eHeavy Duty Aluminium Gearcase\u003c\/td\u003e\n                                    \u003c\/tr\u003e\n                                                                    \u003ctr\u003e\n                                        \u003ctd\u003e\u003cstrong\u003eGearbox Manufacturer\u003c\/strong\u003e\u003c\/td\u003e\n                                        \u003ctd\u003ePRM\u003c\/td\u003e\n                                    \u003c\/tr\u003e\n                                                                    \u003ctr\u003e\n                                        \u003ctd\u003e\u003cstrong\u003eHydraulic or Mechanical\u003c\/strong\u003e\u003c\/td\u003e\n                                        \u003ctd\u003eMechanical\u003c\/td\u003e\n                                    \u003c\/tr\u003e\n                                                                    \u003ctr\u003e\n                                        \u003ctd\u003e\u003cstrong\u003eShaft Arrangement\u003c\/strong\u003e\u003c\/td\u003e\n                                        \u003ctd\u003eDrop Centre\u003c\/td\u003e\n                                    \u003c\/tr\u003e\n                                                                    \u003ctr\u003e\n                                        \u003ctd\u003e\u003cstrong\u003eGearbox Coupling\u003c\/strong\u003e\u003c\/td\u003e\n                                        \u003ctd\u003e4\", 4 holes, 3-1\/4\" PCD, 2-1\/2\" female register\u003c\/td\u003e\n                                    \u003c\/tr\u003e\n                                                                    \u003ctr\u003e\n                                        \u003ctd\u003e\u003cstrong\u003eGearbox Spline\u003c\/strong\u003e\u003c\/td\u003e\n                                        \u003ctd\u003e10 teeth B10 x 23 x 29mm DIN 5464\u003c\/td\u003e\n                                    \u003c\/tr\u003e\n                                                                    \u003ctr\u003e\n                                        \u003ctd\u003e\u003cstrong\u003eNominal Power Rating Light Commercial\u003c\/strong\u003e\u003c\/td\u003e\n                                        \u003ctd\u003e0.83 BHP \/ 100 RPM\u003c\/td\u003e\n                                    \u003c\/tr\u003e\n                                                                    \u003ctr\u003e\n                                        \u003ctd\u003e\u003cstrong\u003eNominal Power Rating Pleasure\u003c\/strong\u003e\u003c\/td\u003e\n                                        \u003ctd\u003e1.26 BHP \/ 100 RPM\u003c\/td\u003e\n                                    \u003c\/tr\u003e\n                                                                    \u003ctr\u003e\n                                        \u003ctd\u003e\u003cstrong\u003eRatio Ahead Stern Description\u003c\/strong\u003e\u003c\/td\u003e\n                                        \u003ctd\u003e2.04:1\u003c\/td\u003e\n                                    \u003c\/tr\u003e\n                                                                    \u003ctr\u003e\n                                        \u003ctd\u003e\u003cstrong\u003eReplaces\u003c\/strong\u003e\u003c\/td\u003e\n                                        \u003ctd\u003ePRM-80D2\u003c\/td\u003e\n                                    \u003c\/tr\u003e\n                                                                    \u003ctr\u003e\n                                        \u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n                                        \u003ctd\u003ePRM\u003c\/td\u003e\n                                    \u003c\/tr\u003e\n                                                                    \u003ctr\u003e\n                                        \u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n                                        \u003ctd\u003e11.25kg (24.5lbs)\u003c\/td\u003e\n                                    \u003c\/tr\u003e\n                                                                    \u003ctr\u003e\n                                        \u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n                                        \u003ctd\u003eUnited Kingdom\u003c\/td\u003e\n                                    \u003c\/tr\u003e\n                                                                    \u003ctr\u003e\n                                        \u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n                                        \u003ctd\u003e2 Years\u003c\/td\u003e\n                                    \u003c\/tr\u003e\n                                                                \u003c\/tbody\u003e\n                            \u003c\/table\u003e\n                        \u003c\/div\u003e\u003cbr\u003e\u003cdiv class=\"panel-body\"\u003e\n                                                                    \u003ca class=\"icon-group\" href=\"https:\/\/d1blekj7w4kc3j.cloudfront.net\/files\/catalogue\/products\/technical-article-gearboxes-and-spares.pdf\" target=\"_blank\" rel=\"noopener\"\u003e\n                                        Technical Article - Gearboxes \u0026amp; Spares\n                                        \u003ci class=\"fas fa-download\"\u003e\u003c\/i\u003e\n                                    \u003c\/a\u003e\n                                                            \u003c\/div\u003e\u003cbr\u003e\u003cp\u003e\u003cstrong\u003eManufacturer Part Number: 90D2\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg align=\"right\" src=\"https:\/\/d1blekj7w4kc3j.cloudfront.net\/images\/presets\/product_page_normal\/catalogue\/products\/PRM-Logo_1.jpg\" alt=\"\" title=\"\" width=\"200\"\u003e\u003c\/p\u003e","brand":"PRM","offers":[{"title":"Default Title","offer_id":57809865277814,"sku":"AQ PRM-90D2","price":1262.14,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1078\/5560\/files\/prm-90d2.jpg?v=1778100515","url":"https:\/\/shop.chastheboat.co.uk\/products\/prm-90d-drop-centre-marine-gearbox-ahead-ratio-2-04-1-prm-90d2","provider":"ChasNewensMarine","version":"1.0","type":"link"}