New Holland T8040 Tractor Service Repair Manual

SER VICE MANUAL

T8010 [Z8Rx06001 - ]

T8020 [Z8Rx06001 - ]

T8030 [Z8Rx06001 - ]

T8040 [Z8Rx06001 - ]

T8050 [Z8Rx06001 - ] 84318454

PRIMAR Y

PRIMAR Y

PNEUMA TIC SYSTEM

ELECTRICAL POWER SYSTEM

LIGHTING SYSTEM

FRONT AXLE

2WD - 4WD SYSTEM Hydraulic

STEERING Hydraulic

SER VICE BRAKE Hydraulic

P ARKING BRAKE Hydraulic

BRAKE

USER

HITCH Rear hitch

INTRODUCTION

W ARNING

Hydraulic fluid escaping under pressure can have enough force penetrate the skin. Hydraulic fluid may also infect a minor cut opening the skin. injured escaping fluid, see a doctor once. Serious infection reaction can result medical treatment not given immediately Make sure all connections are tight and that hoses and lines are good condition before applying pressure the system. Relieve all pressure before disconnecting the lines performing other work the hydraulic system. T o find a leak under pressure use a small piece cardboard Never use Failure comply could result death serious injury .

M252A

W ARNING

When removing hardened pins such a pivot pin, a hardened shaft, use a soft head (brass bronze) hammer use a driver made from brass bronze and a steel head hammer

M497

W ARNING

When using a hammer remove and install pivot pins separate parts using compressed air using a grinder , wear eye protection that completely encloses the eyes (approved goggles other approved eye

M498

W ARNING

Use suitable floor (service) jacks chain hoist raise wheels tracks off the floor . Always block machine placed with suitable safety stands.

M499

W ARNING

When servicing repairing the Keep the shop floor and operators compartment and steps free oil, water , grease, tools, etc. Use oil absorbing material and shop cloths required. Use safe practices all times.

M500

W ARNING

Batteries contain acid and explosive Explosions can result from flames wrong cable nections. T o connect the jumper cables correctly the battery this machine see the Operators Manual. Failure follow these instructions can cause serious injury death. M504

DISTRIBUTION SYSTEMS - PRIMAR Y HYDRAULIC POWER SYSTEM

Hydraulic pump - Dynamic description

T8050

The tractor uses three hydraulic pumps which are driven through a drive housing the right side the range The pump drive housing gears are driven the O drive line and all the pumps turn approximately times engine A PFC (pressure and flow compensating) piston pump attached the front the pump drive while the tandem gear pumps are attached the rear the pump drive

The front section the tandem gear pump supplies the regulated pressure circuit: brake valve, transmission control O and dif ferential lock auxiliary and hitch valve pilot The rear section supplies charge flow the PFC The PFC pump supplies flow the priority which directs flow the steering remote valves and the three point

All hydraulic lines are equipped with O - ring face seals ensure vibration - resistant

Charge / lubrication pump

The charge / lubrication pump the rear section the dual gear pump and used supply the main PFC pump with a charged inlet condition prevent The pump also supplies lubrication and cooling requirements for the

The pump draws oil from the transmission housing through a 100 mesh suction The pump flow directed across the main filter assembly provide clean charge and lubrication

The pump flow rate rated speed 2667 RPM ( 2000 RPM engine speed) 177.0 l / min ( 47.0 gpm ) .

Regulated circuit pump

The regulated circuit pump the front section the tandem gear The pump draws oil from the system reservoir through a 100 mesh suction The pump flow passes through the regulated circuit filter housing and into the priority regulator The priority regulator valve maintains the regulated pressure circuit 22.424.5 bar ( 325 - 355 psi ) The regulated pump flow supplies the O / dif ferential lock transmission control valves and brake The remote and hitch valves are also supplied with regulated

Once these circuits are the excess regulated pump flow directed through the oil coolers and joins with the charge pump flow the downstream side the main filter

The pump flow rate rated speed 2667 RPM ( 2000 RPM engine speed) l / min ( gpm )

PFC piston pump

The axial piston pump has a variable flow output and can operate variable The pump matches the hydraulic power output the actual load requirements ensure maximum ficiency and the minimum use

The pump inlet charged prevent The pump output flow supplied the priority regulator The priority regulator valve gives top priority the steering system and trailer brake Once the steering system and trailer brake circuits are satisfied the priority regulator valve supplies pump flow the remote auxiliary valves and three point hitch

The maximum pump flow rate for the standard pump rated speed 2667 RPM ( 2000 RPM engine speed) 146.0 l / min ( gpm )

NOTE: The standard pump system delivers approximately 1 13.6 l / min ( 30.0 gpm ) through a single remote This due resistance created oil flowing through restrictive passage ways and long lengths tubing

Optional high flow PFC piston pump

optional high flow PFC piston pump The high flow rate maximum pump flow rate rated speed 2667 RPM ( 2000 RPM engine speed) 220 l / min ( gpm ) .

NOTE: The high flow pump system delivers approximately 1 13.6 l / min ( 30.0 gpm ) through a single remote tion. This due resistance created oil flowing through restrictive passage ways and long lengths tubing 84318454 14/03/2010

DISTRIBUTION SYSTEMS - PRIMAR Y HYDRAULIC POWER SYSTEM

However , when operating two more remote sections the high flow pump has approximately l / min ( gpm ) more flow than a standard pump system supply the additional remote

RCPH07CCH026F

Charge / lubrication pump outlet (rear section) High flow PFC piston pump Regulated circuit pump outlet (front section) Dual gear pump / regulated system filter housing

Optional Megaflow PFC piston pump

The axial piston pump has a variable flow output and can operate variable The pump matches the hydraulic power output the actual load requirements ensure maximum ficiency and the minimum use fuel. The maximum pump flow rate rated speed 2667 RPM ( 2000 RPM engine speed) 1 l / min ( gpm )

The pump inlet charged prevent The pump output flow supplied directly the remote auxiliary The manifold equipped with internal plugs separate the dual flow supply flow , signal line pressure and signal line pilot relief from the standard PFC piston pump The Megaflow pump supplies only the fourth fifth remote sections. The two PFC pump hydraulic circuits operate independently .

NOTE: The Megaflow pump system delivers approximately 1 l / min ( gpm ) through a single remote This due resistance created oil flowing through restrictive passage ways and long lengths tubing hose.

1

DISTRIBUTION SYSTEMS - PRIMAR Y HYDRAULIC POWER SYSTEM

RCPH07CCH027F 2

Megaflow signal line Standard PFC pump

Megaflow outlet Megaflow inlet

Megaflow PFC pump Main filter assembly

Lubrication circuit

The lubrication flow a combination both dual gear outputs – filtered charge pump flow and filtered / cooled excess regulated circuit flow Inlet charge pressure and lubrication are limited bar ( psi ) a lube relief

The lubrication circuit provides a low pressure flow oil lubricate and cool the following transmission components: master bevel pinion drop odd / even MFD / creep drive and O / dif ferential lock

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RCPH07CCH029F 3

Regulated pressure circuits

The regulated circuit supplied the front dual gear The pump flow passes through the regulated circuit filter housing and onto the priority regulator valve. The pressure regulator portion the valve maintains the regulated pressure - bar ( 325 - 355 psi )

The following components are supplied the regulated circuit:

• speed transmission powershift

• odd / even transmission powershift valve (includes creep and park brake),

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Drop box rear bearing lube

DISTRIBUTION SYSTEMS - PRIMAR Y HYDRAULIC POWER SYSTEM

• range transmission powershift valve (includes

• O / dif ferential lock

• master clutch inching

• brake

• hitch valve pilot

• remote valve pilot pressure

• and MFD clutch supply

DISTRIBUTION SYSTEMS - PRIMAR Y HYDRAULIC POWER SYSTEM

DISTRIBUTION SYSTEMS - PRIMAR Y HYDRAULIC POWER SYSTEM

Pump drive - Exploded view

T8050

RCPH07CCH653FBC 1

Pump drive housing Bearing cup

Idler shaft Bearing cone

Bearing Driven gear

Spacer Shim

Retaining ring 1 O - ring

Idler gear Bearing cone

DISTRIBUTION SYSTEMS - PRIMAR Y HYDRAULIC POWER SYSTEM

Control valve Priority / Regulator valve - Dynamic description

T8050

The priority / regulator valve assembly located the top right side the range The assembly contains:

• the priority spool,

• the regulator

• and steering relief valve.

The front section the dual gear pump and the pressure and flow compensating (PFC) piston pump supply oil the priority / regulator

Priority spool ( supplied the PFC piston pump)

Oil flows into the priority / regulator valve from the left side port (2) . Steering has first priority: oil flows across the priority spool and out the steering supply port (3) There a cross - drilled passage near the top the priority Oil enters this orifice and starts build pressure against the steering demand pressure builds the top the priority spool and the spool moves down against its spring, opening a passage the remote and hitch circuits (13)

When the steering circuit placed demand, a pressure drop created the top end the priority spool. Signal and spring pressure work against pump outlet and the priority spool moves accommodate steering

Once steering demand pressure builds the top the priority spool and the spool shifts down increase flow the remote and hitch When equipped with trailer oil also supplied from the priority valve the trailer

DISTRIBUTION SYSTEMS - PRIMAR Y HYDRAULIC POWER SYSTEM

RCPH07CCH016GAE

Regulator spool (supplied regulated pump section)

Regulated pump flow enters the priority / regulator valve the right side port (7) Oil flows across the regulator spool (12) and supplies all the regulated circuits through the side port (6) and top port (4) . The oil also flows through the orifice near the top the regulator This oil builds pressure and moves the regulator spool against the 84318454 14/03/2010

DISTRIBUTION SYSTEMS - PRIMAR Y HYDRAULIC POWER SYSTEM

This regulates pressure and maintains the - bar ( 325 - 355 psi ) the regulated These include the transmission control O / dif ferential lock brake valve and regulated pressure for remote valve and the hitch valve pilot

When all regulated circuit demands are the regulator spool continues maintain the 22.424.5 bar ( 325 - 355 psi ) pressure and allows excess pump flow out the cooler supply port (5)

When a regulated circuit the regulator spool senses a momentary drop The spring will overcome the spool and move increase flow oil meet the demand. the demand met, pressure again builds the top side the spool through the orifice and moves the spool down maintain regulated RCPH07CCH004F

DISTRIBUTION SYSTEMS - PRIMAR Y HYDRAULIC POWER SYSTEM

Priority regulator valve

Supply from PFC piston pump

Supply steering

Regulated supply system 1

Excess flow coolers

Regulated supply brakes

RCPH07CCH016GAE 4

Regulated pressure adjustment

Steering relief adjustment

Steering signal hand pump

Priority spool

Regulator spool

Supply remote valves

Regulated supply 14. Internal plug

Priority regulator valve with pressure solenoid

NOTE: T8050 only

The priority / regulator valve equipped with a pressure solenoid valve (1) which not

The pressure solenoid uses feedback from the pressure transducer , through the transmission controller , maintain a tighter tolerance regulated system pressure. The solenoid maintains full regulated pressure the transmission clutches regardless temperature other demands the regulated pressure

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DISTRIBUTION SYSTEMS - PRIMAR Y HYDRAULIC POWER SYSTEM

Control valve Priority / Regulator valve - Exploded view

T8040

RCPH07CCH028GAE 1 Priority / regulator valve body

DISTRIBUTION SYSTEMS - PRIMAR Y

DISTRIBUTION SYSTEMS - PRIMAR Y HYDRAULIC POWER SYSTEM

Pressure / flow compensating (PFC) pump - Dynamic description

T8050

NOTE: The principles operation for the standard flow pump apply both the optional high flow pump and Megaflow pump The illustrations below depict the standard flow

Principle Control

All remote the hitch control the optional trailer brake and optional power beyond circuit contain a signal Each signal port directs a signal equal the working pressure that through signal lines and check valves the pump compensator The compensator angles the pump swash plate meet system

A check valve located each signal line between the control valves and the compensator several control valves are operated the same the signal line the highest pressure causes the other check valve(s) the lower pressures seat themselves. This prevents signal bleed f through other control valves and ensures that the highest signal pressure acts the compensator

The pump designed operate two dif ferent modes according the demand for flow and pressure. The modes ares:

• Low pressure standby: When there demand for flow the pump provides just enough flow make for internal leakage the hydraulic system low this mode the pump requires very little power drive

• Pressure / flow delivery and compensation: When there a demand for flow and pressure from the hydraulic the pump responds provide only the flow This limits the power consumption the

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DISTRIBUTION SYSTEMS - PRIMAR Y HYDRAULIC POWER SYSTEM

Control piston Piston block loading spring

Control spring Piston block

Drive set Back plate

Pump housing Compensator assembly

Swash plate 1 Control piston rod

Piston RCPH07CCH037F 2 Pressure compensator

Signal line pressure High pressure compensator spool Pump case drain High pressure spring

Control piston pressure Compensator assembly

Piston pump outlet pressure Flow compensator springs

Flow compensator spool Orifice plug

Low pressure stand

When there demand for flow , there pressure signal feedback the and the pump enters low pressure standby mode. Since there place for pump oil flow , pressure builds the pump outlet passage. This pressure through internal passages the pump back the end the compensator spool opposite the

The spring acting the flow compensator spool allows the spool move a 23.527.0 bar ( 340 - 390 psi ) dif ential At this the flow compensator spool moves down and allows oil flow into the passage the pump control

Pressure this control piston tilts the pump swash plate against the swash plate control spring a near neutral this the pump provides just enough flow make for internal thus maintaining a minimum system pressure 23.527.0 bar ( 340 - 390 psi ) .

The pump remains the low pressure standby position long there pressure flow demand from the hydraulic system. this mode, the pump produces very little heat and absorbs very little horsepower from the engine.

Engine Start

Before the engine started, the pump swash plate angle its maximum angle. soon the engine cranked the starter motor , the pressure and flow compensating (PFC) pump produces flow and pressure builds the pump

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DISTRIBUTION SYSTEMS - PRIMAR Y HYDRAULIC POWER SYSTEM

delivery When this pressure reaches - bar ( 340 - 390 psi ) the pump enters its low pressure standby This occurs almost instantly and makes engine starting easier

Pressure / flow delivery and compensation

When oil required the flow controlled the dif ference pressure opposite ends the compensator

When a control valve pressure the outlet the piston pump drops slightly Spring and signal line pressure shift the flow compensator spool away from the spring allowing oil from the control piston drain past the spool and

the oil drains out the control piston, the swash plate angle increases and pump flow rises until the flow demand has been The flow from the pump determined the size the orifice the control valve which being This orifice created limiting the main valve spool travel within the control

When a control valve oil pressure the circuit being supplied increases its operating This pressure transmitted through the sensing line the spring end the compensator

Increased flow demand

When additional control valve pressure drops slightly the pump pressure The sator spool moved and allows the oil behind the control piston drain The swash plate moves and pump flow increases until the extra demand for flow has been

Pressure the pump outlet increases until - bar ( 340 - 390 psi ) above the signal line This pressure increase moves the pump compensator spool against the allowing suf ficient flow past the spool the control piston. This action the piston moves the swash plate a position where increased flow maintained and the pressure

Decreased flow demand

When flow demand pump pressure increases until the pump outlet pressure exceeds the signal line sure more than 23.527.0 bar ( 340 - 390 psi ) The flow compensator spool moves down allow some oil flow into the pump control This action the piston destrokes the pump against the spring and reduces pump flow

When pump flow falls match the reduced the dif ference pressure sensed the opposite sides the compensator spool returns 23.527.0 bar ( 340 - 390 psi ) . The compensator spool moves and blocks f the passage the control which locks the swash plate that pumping

High pressure standby

The hydraulic system protected limiting its maximum pressure 202 - 203 bar ( 2930 - 2950 psi ) through a signal relief This protection for when a hydraulic cylinder reaches the end its stroke when unconnected remote valve

NOTE: Hitch system pressure not limited a signal relief Hitch system maximum pressure limit 224 bar ( 3250 psi )

When system pressure reaches the setting the high pressure compensator the pump high pressure pensator spool shifts against its allowing the full pump pressure applied the pump control This destrokes the pump very rapidly from full stroke almost zero (within 8 The swash plate lizes provide just suf ficient flow make for internal

The pump remains the high pressure standby mode until the valve operation returns neutral. When this occurs, signal line feed from the valve cut Signal pressure drops because the drain orifice plug passage open the pump case When there signal line the pump immediately returns a low pressure standby

DISTRIBUTION SYSTEMS - PRIMAR Y HYDRAULIC POWER SYSTEM