Fiat Allis HD41 41B Crawler Tractors Transmission Service Manual 70695274 – PDF DOWNLOAD

Description

Fiat Allis HD41 41B Crawler Tractors Transmission Service Manual

FILE DETAILS:

Fiat Allis HD41 41B Crawler Tractors Transmission Service Manual

Size : 54.5 MB
Format : PDF
Language : English
Brand: Fiat
Type of machine: Tractor
Type of document: Service Manual
Model: Fiat Allis HD41 41B Crawler Tractors

DESCRIPTION:

Fiat Allis HD41 41B Crawler Tractors Transmission Service Manual

GENERAL INFORMATION:

• Torque converter/transmission lube pressure regulating valve is in the top section of pressure regulating valve,Oil bypassed by main pressure regulating piston flows through the oil radiator to the torque converter.
• Part of this oil lubes the input clutch and part of it returns to sump through the converter drain line, remainder of the oil returns to the transmission lube circuit through this valve.
• This valve does not actually regulate any pressure at low engine speeds, it merely directs oil flow from the torque convert- er to the transmission. Orifices in the plate beneath the lube header maintain pressure in the circuit; the valve opens only when the volume of oil in this circuit is too great to pass through the orifices.
• Excess oil is then dumped to Sump through the torque converter. Ir. a prop- erly working system, valve will not open until engine speed exceeds 1600 rpm. Orifices in the plate beneath the lube header vary in size to satisfy the different lubrication requirements in the transmission clutches and bearings.
• Input clutch control valve is In the bottom section of pressure regulating valve. This valve regulates no pressure, it merely con- trols the supply of main circuit oil to the input clutch.
• Main circuit oil is supplied to this valve at all times.In neutral, Fig. l,the oil enters a drilled passage in the center of the valve piston to hold the piston in closed position. When the input clutch nas been engaged, .
• oil from flow sensing piston in shift inhibiting valve forces the piston open, allow- ing oil in main circuit to engage the clutch. Clutch will remain fully engaged as long as oil pressure is applied to the top of the control valve piston.
• When this pressure is no longer applied, main circuit oil in center of the piston will force the piston closed — shutting off the main oil supply to the input clutch. Oil in clutch sumps through the dump valve in clutch carrier.
•  regulates signal oil flow to direction clutch shuttle valves. In neutral. Fig. 1,piston is centered in its bore, blocking this oil flow. When a direction shift has been made. Fig. 2, piston is forced off-center by oil from travel control valve.
• Signal oil (from main circuit)flows to the end of shuttle valve which controls main oil flow to desired direction clutch and the clutch is engaged (refer to 1.2. 7 for description of the shuttle valve).
• As direction control piston is forced off-center, an internal oil passage leading to flow sensing piston is opened; incoming oil from travel control valve flows through this passage to the flow sens- ing piston. This oil is restricted to assure com- plete engagement of direction clutch before input clutch circuit is charged with oil.

FIAT ALLIS HD41 41B CRAWLER TRACTORS TRANSMISSION SERVICE MANUAL 70695274 – PDF DOWNLOAD:

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