Item 8 REV-DW.doc

HYDRAULICALLY REVERSIBLE PLOW DOUBLE WING

WITH ALL SUPPORTING EQUIPMENT (HIGH TOWERS)

Item 8

HYDRAULICALLY REVERSIBLE PLOW DOUBLE WING

WITH ALL SUPPORTING EQUIPMENT (HIGH TOWERS)

1. HITCH

_____ 1.1 Custom side plate model designed, constructed and installed for extreme service.

_____ 1.2 Quick detachable and pivoting for access to engine compartment, utilizing plow ram and 1 1/4” pins. There shall be three (3) plow pinning heights located at 15.5”, 18” and 20.5” heights on 31” centers. It shall be readily removable for summer storage leaving the hydraulic pump mounted to the chassis.

_____ 1.3 Shall be minimum 5/8” steel construction.

_____ 1.4 Integral heavy duty upper and lower horizontals for right and/or left wing tower of HSS 6”x4”x3/8” minimum steel tube.

_____ 1.5 Shall be designed, constructed to accommodate interchangeability of various plows and plow frames in use by Fleet Services, Maine Department of Transportation.

_____ 1.6 Shall accommodate installation of engine crankshaft driven pump or PTO assembly.

_____ 1.7 Shall be designed, constructed and installed to keep the effects of weight and leverage of plow and plow frame to an absolute minimum and transmit plow forces directly to the truck frame side rails.

_____ 1.8 Plow ram must be 4" diameter x 14” stroke with a 1 3/4” diameter double nitrided piston, rod providing 20.75” lift minimum.

_____ 1.9 The support frame shall be adjustable in height during installation to accommodate varying frame heights and chassis frames.

_____ 1.10 The front mast shall be constructed of two 4”x4”x1/2” angle vertical members reinforced with a 4”x4”x1/2” horizontal top angle, a 4”X4”X1/2” cylinder base angle and a 3”x2”x1/4” base tube.

_____ 1.11 There shall be a 1/2” thick upper cheek plate bolted to the front frame ends to carry the vertical loading. There will also be a 1/2”x24” frame rail reinforcement bolted to the frame above the front axle.

_____ 1.12 The lift arm shall be fabricated from 1” flame cut plate, braced with two 1/2”x2” steel flat bar plates. The lift arm shall have a triple point chain hook allowing either single or double chaining.

_____ 1.13 The hitch shall be mounted at not more than 18” measured from truck grill to plow attach hole center.

_____ 1.14 The base bracket and hitch frame mounting pin holes must be reinforced internally and externally by a HSS steel washer 3/8” thick welded as a boss to prevent elongation of the pin mounting holes due to vibration.

_____ 1.15 A suitable rubber block must be installed between the base bracket and hitch frame to provide tension on the mounting pins which is intended to reduce or stop vibration.

_____ 1.16 One adjustable turn buckle must be provided to secure detached hitch portion to the front plow, which will allow for stand alone storage.

_____ 1.17 Two side winding screw adjustable parking legs (jacks) mounted on each end of hitch cross tube to allow for hitch assembly removal (minimum 1,000 lb capacity).

2. REVERSIBLE PLOW WITH CONTOUR CHANGE

_____ 2.1 Hydraulically reversible. Reverse action provided by two 3 1/2” diameter double nitrided cylinders designed with 2,000 PSI pressure relief.

_____ 2.2 Designed and constructed for extreme service.

_____ 2.3 Length of cutting edge shall be 11', cleared path 9’ at 35 degree of swing.

_____ 2.4 Adjustable height of 33” minimum and 51” maximum with sufficient overhang and curvature for high speed plowing.

_____ 2.5 Cutting edge with trip edge mechanism fully exposed for convenient servicing.

_____ 2.6 Lower moldboard reinforcement shall be 4”x4”x1/2” steel angle minimum.

_____ 2.7 Minimum of six torsion type springs not less than 7/8” wire x 3”x3/4” O.D. with not less than 16 active coils each. Springs to be mounted horizontally and must be preloaded to require an initial tripping force of approximately 1900 ft. lbs. at full compression.

_____ 2.8 Trip edge attachment supports shall be ½” plate steel minimum on both the trip edge backer angle and moldboard rib structure.

_____ 2.9 AASHTO standard punching with carbide steel cutting edge.

_____ 2.10. Retainer plate secured below center pin to prevent pin from falling out.

_____ 2.11 Attack angle of cutting edge must be easily adjustable from 60° through 85°.

_____ 2.12 Control switch or lever for hydraulically reversing must be attached with other plow functions.

_____ 2.13 Plow must be capable of automatically changing contour through the use of hydraulics to act as a left or right hand one way tapered plow and as a straight, non tapered reversible plow.

_____ 2.14 The flared or discharge end of the plow shall coincide with the direction to which the moldboard has been angled.

_____ 2.15 The tapered moldboard shall assume an inside height of 33” at the low side and 51” at the discharge side whenever angled to the extreme right or left positions from center.

_____ 2.16 Hydraulic contour changing must be activated by and in conjunction with plow reversing.

_____ 2.17 Moldboard material shall be one piece non-spliced 3/8” thick ultra high molecular weight polyethylene with a minimum tensile strength of 7000 PSI (in accordance with ASTMD638).

_____ 2.18 The polyethylene materials shall be made from new resin (recycled material not acceptable), and shall be color impregnated and ultra violet stabilized safety yellow pigmentation.

_____ 2.19 Plow weight approximately 2400 lbs. minimum.

_____ 2.20 Side winding screw adjustable leg (jack) positioned to support and balance plow when removed (minimum 1,000 lb capacity).

3. DOUBLE WING PLOWS

_____ 3.1 Appropriate model for either 54,000 GVW or 32,000 GVW vehicle, whichever is required.

_____ 3.2 Heavy duty model.

_____ 3.3 Overall blade length 10’ on 32,000 GVW vehicle or 11’ on 54,000 GVW vehicle. The overall wing length shall be 11’ on the 32,000 GVW vehicle and 12’ on the 54,000 GVW vehicle.

_____ 3.4 Minimum ten gauge moldboard. The moldboard shall be fabricated with a 1” nose plate. The moldboard shall be supported by four 1/2” flame cut ribs. The top of the moldboard shall be supported by a 3”x3”x1/4” HSS tube with intermediate support of 1/2”x4” flat bar and two 1/2”x4”x4” angle arm bracket supports.

_____ 3.5 The backer angle will be 6”x4”x3/4” angle minimum gusseted with 3/8” triangular plate, AASHTO standard punching.

_____ 3.6 The wing shall include two mounting positions for a 1 1/2” pivot bolt. The pivot bolts shall be reinforced with a 1/2” plate washer welded to the skin plate.

_____ 3.7 The wing arm attachment bracket shall be bolted in place and adjustable in position. The arms shall be pinned with a 1” diameter grade eight plated hex cap screw secured with a Nylok hex nut.

_____ 3.8 The blade shall be 1/2” x8” C-1085 steel reversible cutting edge with coped corners on the intake end. There shall be two cast iron wear shoes bolted behind and through the base angle. The blade and shoes shall be secured with 5/8” grade five plated carriage bolts.

_____ 3.9 Attack angle of 85°.

_____ 3.10 A removable safety chain attached to the nose of the plow must be provided.

4. DOUBLE (HIGH TOWERS)

_____ 4.1 Cable hydraulic operated heavy duty high towers.

_____ 4.2 The rear tower slide trays shall be a minimum of 12” structural channel @ 25 lbs./ft. vertical reinforced by two full height structural 4”x3”x1/2” angle. It shall also have one intermediate 1/2” plate brace. This 1/2” brace shall serve as the support member for the wing arm lift cylinder which will be located in the interior side of rear tower.

_____ 4.3 The rear towers shall have an open section design.

_____ 4.4 The rear towers shall have a top mounted self aligning wire rope exit.

_____ 4.5 The slide control cylinders shall be exposed for ease of service.

_____ 4.6 Rear tower shall have bolted connections to the rear saddle to allow for various frame heights and off season removal without disturbing the hydraulic system. The tower shall be perpendicular to the truck chassis. All tower bracing that extends below the chassis rail must be removable.

_____ 4.7 The slide control cylinder shall be a 3 1/2” diameter bore x 42” stroke double acting with a double nitrided piston rod. Both oil ports will be on the base end.

_____ 4.8 The wing control cylinder shall be a 4 1/2” diameter bore x 18” stroke single acting “ram” type double nitrided piston. There shall be triple sheave boxes welded to the base and rod end wire rope travel shall be six times stroke.

_____ 4.9 The slider shall be 3/4” plate with an integral cylinder cover, 3/4” thick double arm mounting ears carrying 1 1/4” diameter grade five plated bolts with Nylock nuts. It shall have 42” of vertical travel.

_____ 4.10 There shall be 6” nominal size sheaves on front and rear towers with extra deep rope grooves with a 1 1/4” diameter axle with greaseable brass bushings.

_____ 4.11 The front towers shall be of open section design.

_____ 4.12 It shall be constructed of 8” @ 18.4 lbs./ft. structural I-beam slide tray. The lift cylinder shall be located behind the tower, rod end down. Shelving shall be achieved by a singe wire rope sheave on the cylinder rod end and a single sheave on the tower top.

_____ 4.13 The slide travel shall be twice the cylinder stroke. The slider shall be retained by two 3/4” structural square bar. At no point shall any part of the tower structure extend above the tower at any point of slider travel.

_____ 4.14 The front towers shall have a lower skid shoe. It also shall have bolted connections to the support tubes.

_____ 4.15 Wings shall have a lift capacity of 72” minimum. It will be achieved by a 3” bore by 36” stroke double nitrided cylinder with a 1 1/2” diameter double acting piston rod, minimum.

_____ 4.16 The rear saddle shall be laterally mounted HSS section of 6”x4”x1/2” wall thickness. There shall be 1/2” “L” shaped cheek plates with the tower end gusseted to form a box with the tower attach bracket. There shall be a minimum of two 3”x3”x3/8” angle braces to stabilize the tower base. (Must be detachable if located below frame rail).

_____ 4.17 Designed to be quick detachable including wing posts (and hydraulics) by the use of quick disconnecting fittings. (Fittings to be 1/2” diameter, Parker).

_____ 4.18 Trip mechanism and wing plows to be approved by Fleet Services/MaineDOT. The trip spring shall be a torsion type spring with a 1” diameter wire, minimum. Trip device shall be plumb.

_____ 4.19 The rear tower height shall be same as front tower height.

_____ 4.20 Cables that operate over sheaves must be adjusted so that at maximum stroke, cable clamps, etc., will not be pulled into the sheaves.

_____ 4.21 Push arms for 10’ wing plows must be 5’ minimum.

_____ 4.22 All cables must be minimum 1/2” diameter 8 by 19 construction, improved plow steel.

_____ 4.23 If possible the rear towers must be angled to provide a straighter alignment for push arms and push arm joints.

5. HYDRAULICS

_____ 5.1 Load sense pump - 4.33 CID, front mount and cast iron construction. The pump case drain must be plumbed directly to tank not through return filter. The load sense stand by pressure should be set at 325 PSI and be internally drained to allow a dynamic flow for the sense signal. Rexroth model A10V071 or pre approved equal.

_____ 5.1a. Additional hydraulically powered equipment a 6.1 CID load sense pump Rexroth model A10V100 must be substituted for hook lift system.

_____ 5.2 Spicer drive shaft #C9553-SF-NG with proper angle of installation.

_____ 5.3 Low oil safety circuit, consists of direct mount block valve, tank mounted float switch and system override. System shall automatically shut down at low oil level and be capable of also being manually shut off and locked out.

_____ 5.4 Directional Control Valve: Sauer Danfoss PVG32 or approved equal. The valve must be compensated, proportional and load independent.

_____ 5.5 Pressure and Flow: each valve must be settable with pressures up to 5,000 psi and the flow rating up to 35 gpm. Valve must be of laminar flow design for minimum pressure drop. Valve must have adjustable flow control on both sides of the spool.

_____ 5.6 Relief valves must include settable reliefs.

_____ 5.7 Electrically Activated Coils: all coils shall have actuation valve and must be able to be manually or electrically controlled. Electrical actuation must be controllable with a PWM signal for fully proportional or on/off operation from one coil. Separate coils not acceptable. Coil shall have Deutush female plugs located on the end of coil. Spools must have a heavier centering springs. Valve assembly must accommodate up to 13 work sections, valve must be available in either open or close center configurations.

_____ 5.8 Minimum 40 gallon oil reservoir capacity with pressurized filler breather.

_____ 5.9 The system will also utilize a full flow return line filter. This filter will have ten micron filtration and a 23 PSI bypass. Installation will allow for ease of servicing. Hycon model #MFBN160G10M1.0/12.2B3.1 filter shall be supplied.

_____ 5.10 All hydraulic valving for body, plows and spreader shall be in one central assembly. Multiple valve assemblies are unacceptable. All plow sections shall have field adjustable low (speed) controls. Installation will be done to state requirements and approved at prototype inspection.

_____ 5.11 Valves are to be mounted in a ten gauge weatherproof enclosure outside the frame rails. Enclosure must be designed, constructed and installed for easy, quick, complete accessibility and repair.

_____ 5.12 An in line high pressure filter will be mounted between the pump and main valve. A Hycon model #DFBN3HC160G10B1.1/12-B6YP shall be supplied with an extra element.

_____ 5.13 Spreader control system must be electrical and be easily and readily convertible to closed loop ground speed orientation by changing control head only.

_____ 5.14 Spicer end yokes 2-4-533 and engine flange 2-2-479 series 1310.

_____ 5.15 Spicer series 1310 PTO shaft slip joint non greasable tubular driveline with non greasable u-joints C9533-SF-NG.

_____ 5.16 Parker 1/2” disconnect couplers shall be used on hydraulic lines to all quick detachable parts, including front hitch and wing posts. Parker hoses and fittings preferred.

_____ 5.17 PTO shaft and universals must be guarded and must be able to be easily serviced.

6. HYDRAULIC OIL TANK

_____ 6.1 It shall have a “shed roof” design of approximately 35o (and a floor of 1/4” plate steel).

_____ 6.2 Tank shall have sight gauge and electrical float switch to indicate proper oil level. (Hycon part #FSK 176.2.3.C/12 or approved equal).

_____ 6.3 The tank shall have a capacity of 40 US gallons with baffle, breather, Hycon sight gauge, magnetic drain plug and internal feed line screen with a bypass.

_____ 6.4 The Hycon sight gauge must be reversible from the left to right side of tank.

_____ 6.5 Fill port cap will have an integral screen pressurized with a three PSI vent. Unit will be installed in such a manner to prevent entry of contaminants including snow and rain while either open or closed.

_____ 6.6 Hydraulic tank shall be fabricated utilizing minimum 7 gauge steel _____ 6.7 Suction outlet on the tank shall be protected by an internal screen of approximately 35 micron with an integral bypass in the tank.

_____ 6.8 Suction strainer must be externally removable for ease of replacement and servicing. (Buyers #SW3002003).

_____ 6.9 A full flow/2” shut off ball valve shall be mounted in the suction line. The return line will incorporate a full flow check valve mounted between the return line filter and Parker tank inlet or approved equal.

_____ 6.10 The tank shall be bolted to the rear saddle for ease of cleaning.

_____ 6.11 The tank must have a 2” threaded pipe opening located in such a position to easily install an electric oil heater. The internal oil baffle must not interfere with the heating element.

_____ 6.12 On trucks equipped with hopper sanders, a suitable step of steel grate approximately 14”x 16” must be attached to the hydraulic shed tank roof.

7. GENERAL

_____ 7.1 All parts and components must be compatible with equipment currently in use by Fleet Services, Maine Department of Transportation.

_____ 7.2 Ten (10) parts and repair manuals as necessary.

_____ 7.3 All equipment shall be primed with 2 coats of rust proof lead free primer.

_____ 7.4 Finish coat of lead free Dupont 3.5 Imron High Gloss Plow Yellow.

_____ 7.5 All equipment must be thoroughly inspected, serviced and be ready for use upon delivery.

_____ 7.6 Plow lights must be of halogen type, low profile, professionally mounted and wired with a weather pack type plug-in device for quick disconnect mounted in the engine compartment (socket must not be mounted in or through hood).

_____ 7.7 All wiring must be protected by wire loom and be weatherproof, soldered connections and heat shrink wrap must be used on all wiring.

_____ 7.8 All wiring and hoses shall be mounted, routed and fastened in a professional manner to prevent chafing, rubbing, etc.

_____ 7.9 All hardware installed shall not obstruct any vehicle or equipment lubrication points.

_____ 7.10 All hardware installed shall not obstruct or interfere with any vehicle component or system.

_____ 7.11 Vehicle bumper must be quick attachable for summer use and attached to plow hitch with pins.

_____ 7.12 Main plow and plow wings must be capable of installation and/or removal easily by one person.

_____ 7.13 All plow hydraulic cylinders must be easily rebuildable.

_____ 7.14 Electrically controlled solenoids shall be equipped with manual overrides.

_____ 7.15 All hydraulic fittings to be NPT thread with Teflon tape, JIC not acceptable.

_____ 7.16 All cylinders must be double nitrided.

_____ 7.17 Solenoid operated plow valves must be capable of conversion to cable operation if necessary.

_____ 7.18 All feed and return lines must have shut off valves to isolate the hydraulic tank.

_____ 7.19 An emergency light mast of heavy wall steel pipe must be provided and securely fastened to the hydraulic tank. The mast must extend past the cab roof.

APP/kad 12/14/2011

REV-DW.DOC

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