|
|
10. More emphasis has been placed on full operating front wheel hydraulic brakes. Eventually, automatic limiting valves (ALV) will be disallowed. A report filed by the USA National Transportation Safety grease Board identified them as contributing to truck accidents. Many truck manufacturers are pump now hydraulic offering grease a bobtail proportioning valve for front brakes. It senses when the trailer is disconnected by sensing pressure in the tractor air line, and proportions pump air to the drive wheels whenever the tractor is operating without a trailer.Maintenance hydraulic for proper balanceThe secret to successful brake balance through proper maintenance is in keeping the air grease brake system up to OEM (original equipment pump and hydraulic manufacturer) standards. Here is a baker''s dozen of suggestions grease that not only pump keep brakes hydraulic and grease in balance, but they also will contribute to maximum drum and lining life. Truckers that sub-contract brake maintenance should ensure the brake shop that they choose complies with the following: The pump hydraulic systems hydraulic on the D-Series machines are variable flow, load- sensing, closed center systems that provide flow for all cutting edges at all engine grease speeds. The pump on the 416D is an axial piston unit that provides a flow of 37 gpm at 2200 rpm. System pressure is set at 3000 psi. The pump used on the 420D and 430D pump and hydraulic and grease is also a variable flow, axial piston unit with a flow of 43 gpm at 2200 rpm. The pump and hydraulic system pressure is set at 3300 psi. The hydraulic pumps for the D-Series machines are driven off a transmission-mounted PTO. VARIABLE grease LOAD: 2,308 kips.HELIPORT: 65'' x 65''.STORAGE: Mud & Cmt Bulk--7,000 cf; pump LiquidMud--1,316 bbl; Fuel--1,576 bbl; Water forDrilling--3,400 bbl; Potable Water--1,230 bbl.DRILLING hydraulic EQUIPMENT: Drawworks--Nat''l grease and pump 110UE; Pumps--two Gardner Denver PZ9JC; Primemovers--four Cat. D 398; hydraulic Rotary Table--Nat''lC375; Top Drive--Varco.DERRICK: grease Pyramid 147''; 800,000 lb hook load capacity.BOP SYSTEM: Cameron U 13 5/8" x 5,000 x 3;Hydril GK 13 5/8" x 5,000; Hydril pump MSP 21 1/4" x 3,000;Shaffer LWS 20 3/4" x 3,000, Cameron U 7 1/16 x
|