The PRM500 D marine gearbox is suitable for both recreational and commercial vessels. The gearbox is a Drop-Center model, in which the output shaft is 126.7 mm lower than the input shaft. The gearbox\u2019s dual-shaft design includes separate multi-plate clutches (friction plate packs) for forward and reverse operation. This design enables continuous transmission of full rated power in both directions of travel.<\/p>\n
The PRM500 can be used with either left- or right-hand rotation when moving forward, making it particularly well-suited for twin-engine installations. Technical specifications:<\/span><\/p>\n <\/p>\n Operating pressure<\/span> Definitions of Use Categories \u2013 Recreational Use (Pleasure) Definitions of Usage Categories \u2013 Light Commercial<\/span><\/p>\n Vessels with a planing or semi-planing hull, whether used for recreational\u2014 whether for recreational or commercial use\u2014may meet the requirements for light commercial use if the annual operating hours are less than 1,500, full-throttle operation is limited, and the majority of operating time is spent at partial throttle.<\/p>","protected":false},"excerpt":{"rendered":" PRM marine gear<\/p>","protected":false},"featured_media":18337,"template":"","meta":{"_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_robots_imageindex":"","_seopress_robots_snippet":"","_seopress_robots_primary_cat":"","_seopress_robots_breadcrumbs":"","_seopress_robots_freeze_modified_date":"","_seopress_robots_custom_modified_date":"","_seopress_robots_canonical":"","_seopress_social_fb_title":"","_seopress_social_fb_desc":"","_seopress_social_fb_img":"","_seopress_social_fb_img_attachment_id":0,"_seopress_social_fb_img_width":0,"_seopress_social_fb_img_height":0,"_seopress_social_twitter_title":"","_seopress_social_twitter_desc":"","_seopress_social_twitter_img":"","_seopress_social_twitter_img_attachment_id":0,"_seopress_social_twitter_img_width":0,"_seopress_social_twitter_img_height":0,"_seopress_redirections_value":"","_seopress_redirections_enabled":"","_seopress_redirections_enabled_regex":"","_seopress_redirections_logged_status":"","_seopress_redirections_param":"","_seopress_redirections_type":0,"_seopress_analysis_target_kw":""},"product_brand":[],"product_cat":[177208,177355],"product_tag":[],"class_list":{"0":"post-139247","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-merivaihteet","7":"product_cat-vaihteistot","8":"pa_alv-alv-255","10":"first","11":"onbackorder","12":"taxable","13":"shipping-taxable","14":"purchasable","15":"product-type-simple"},"exclude_global_add_ons":[],"addons":[],"yoast_head":"\n
Sturdy construction<\/span>
The transmission housing is made of high-quality cast iron, and its internal reinforcement design increases rigidity and strength. The housing consists of two separate halves to facilitate maintenance. The oil pump and hydraulic control valves are mounted outside the housing, making them easily accessible.
Hydraulic Operation and Lubrication<\/span>
The hydraulic transmission operates on standard lubricating oil with the same viscosity as the oil used in the engine, so automatic transmission fluid (ATF) is not required. The system ensures a quick response to control lever movements, resulting in excellent boat handling. The control lever has a clear mechanical neutral lock position and is compatible with manufacturer-specific remote control systems.
Safe to use<\/span>
The hydraulic system of the gear is robust and reliable in design, but to further enhance safety, it also includes a mechanical locking device. This ensures that, in the unlikely event of a hydraulic system failure, the vessel can be safely steered back to port. The locking mechanism is accessible through a removable cover located on top of the main gearbox housing.
Option for PTO installation<\/span>
A special feature of the PRM500 is its direct-drive power take-off (PTO), which is available as an option. It allows for the use of a Type B hydraulic pump compliant with the SAE J744C standard, providing a cost-effective and space-efficient way to power the vessel\u2019s hydraulic machinery and equipment.<\/p>\n\n
Minimum \u2013 18.27 bar (265 lb\/in\u00b2), maximum \u2013 22.06 bar (320 lb\/in\u00b2). The top of the valve block has two 1\/8\u2033 BSP threaded holes, and the side has an M18 threaded hole for installing a pressure gauge, if one is needed.
Oil Cooling<\/span>
The normal operating temperature of the oil should be 50\u201380 \u00b0C, and the temperature must not be allowed to rise above 90 \u00b0C. An oil cooler is required to maintain the correct operating temperature. The valve block has two 3\/8\u2033 BSP connections for installing the oil cooler.
Propeller thrust<\/span>a
Both forward and reverse propeller thrust is transmitted to the output shaft bearings. The force exerted on the bearings is sufficient for all power ratings approved by the manufacturer.
Propeller Free-Spinning<\/span>
The output shaft of the PRM500D marine transmission can be rotated continuously when the transmission is in neutral and the engine is turned off. For this reason, a propeller shaft brake is not required.<\/p>\n
<\/span>Limited to pleasure boats with a sliding frame; operation at full throttle (maximum RPM) may not exceed 5 % of the total operating time. The remaining operating time must not exceed 90 % of the engine\u2019s maximum RPM. The maximum permitted operating time is 500 hours per year. The selection of a PRM marine transmission in accordance with this classification for commercial use or for long-distance pleasure cruisers is not permitted.<\/p>\n