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Bartlett lifting 5th wheels provide a simple low-cost way to convert standard road tractors into yard tractors.

Bartlett lifting 5th wheels are saving important time and labor in yards all over the world, moving all types of trailers, eliminating the time-wasting cranking of landing gears. They speed-up piggyback operations in rail yards, make containerhandling more efficient at marine terminals, help keep trailer spotting operations moving smoothly at all types of commercial and industrial shipping and material handling facilities.

Two of the 5th wheel models (M85 and M95) permit converted tractors to do double duty spotting trailers and hauling over the road. All other 5th wheel models may also be used for road hauling where trailer height clearance is not a factor, and when an optional road lock is used. Refer to "Road Kit".

Bartlett has specialized in the design and fabrication of lifting 5th wheels for over 30 years - has built an excellent reputation for quality and performance.  Bartlett also makes lifting 5th wheels for trailer dumping.


Top Frame & In-Frame Models

  • Road Kit- If unit is to be used on any public road, a Road Kit is mandatory. The kit is standard on Models M85, M92 and M95.
  • King Pin Release- Pneumatic with cab control valve. For public road use, Road Kit is required.
  • Hydraulic Cylinders- 7" or 8" bore, depending on model .
  • Fluid Type- Anti-wear hydraulic oil with pourpoint rated according to operating temperatures and conditions. (Not included with unit).
  • Pump- Hydraulic gear pump with integral valve. Output at 1500 RPM: 20 gpm, 2000 psi maximum pressure.
  • PTO Ratio- Recommended: Twin cylinder fifth wheel models-- 90-110%: Single cylinder fifth wheel models 80-90%.
  • Air Shift Kit- An air shifting kit for the pump is available as an extra cost option. Kit consists of an air cylinder mounted on pump, manifold and valves for tractor cab, restrictor valve that limits descent speed along with fittings and tubing needed for installation. This kit is required for tilt cab tractors and other applications where air control is desired.
  • Pick-up Ramps- To meet varying tractor requirements, ramps are to be fabricated, and fitted by installer. Instructions included with unit.

Selection Guide

Lifting 5th Wheels For Trailer Spotting

The selection of a lifting 5th wheel for trailer spotting is based on six main factors:

  1. Type of application: For example - yard spotting, marine dock spotting, piggyback loading, off road or public road use.
  2. Gross weight: This includes the weight of the trailer plus load. As shown in the tables, Bartlett lifting 5th wheels are available for handling loads (gross capacity, meaning trailer and contents) from 50,000 bs. to 120,000 lbs.
  3. Lifting height: Landing gear in a normally extended position must be lifted high enough to clear any anticipated obstructions. Most applications require a 13 to 14-inch lift. This will clear obstructions in most normal spotting areas. For use on ramps and other more unusual applications (soft or uneven terrain) Bartlett offers models M95, W18-HYD, and W18HD77T
  4. Installied down height: This is the height (from ground) of the 5th wheel plate in down position when installed on a tractor. It determines whether an installed 5th wheel will be low enough to couple with your lowest trailer(s).
  5. Trailer king pin setting: This is the distance from trailer king in to trailer front (including refrigeration unit. This, and tractor C.A., determines whether there is adequate clearance from the back of the cab to the front of the trailer.  As with any 5th wheel, adequate space is necessary for clearing trailer corners when turning. Regardless of 5th wheel model, base your selection on the trailer having the longest king on setting (and refrigeration unit).
  6. Tractor C.A. dimension and capacity: Be sure you select a tractor with the proper gross weight capacity and C.A. dimension. C.A. refers to the area on top of the tractor frame measuring from the last above-frame obstruction (i.e. transmission mount) behind the cab to the center of the single or tandem axles - an area that must be clear for mounting the 5th wheel. The C.A. must also provide adequate clearance between the back of the cab and the front of the trailer. See NO. 5, Trailer king pin setting.

Direct any questions or inquiries to or call 1-800-292-0235 and speak with our knowledgable Sales Department.

Copyright 1998 Scientific Brake and Equipment Co. All rights reserved.
Revised: February 26, 2007.