Hyundai Diesel Models New Transmission 2010-2011

8/21/2019 Hyundai Diesel Models New Transmission 2010-2011

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Hyundai Diesel Models

20 ~33D-7


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New Style for 7A


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New Version


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Control Block Function


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When (forward/reverse) mode is selected through the solenoid valve

n the control valve, the Hydraulic pressure from the pump flows

nto forward (reverse) clutch pack at 9~14.2kgf/cm2(128~202 psi) of

pressure through the oil delivery lines in the Shaft. This oil makes

plugging of clutch pack by delivering pressure to the clutch piston. At

this time the clutch shaft is revolving while connected with the

turbine of torque converter. With the clutch engaged the clutch drum

also rotates allowing the drive power to connect through the gear to

the output side of the transmission.

Clutch Operation


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Drive Axle


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Wet Disc Brake


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arrier sub assy includes differential device and parking brake. The pinion shaft is

pported by the taper roller bearing in the carrier case and the bolt at the end of

nion shaft,This transfers the power which is delivered from the drive shaft assy to

e ring gear assembled from bolts at a differential device. This power makes the

fferential device run. Since the differential device is connected with an axle shaft

nd a spindle, the power transferred to differential device is delivered to final drive

rough the axle shaft. Parking brake, The park brake system consists of several

ction plate alternating between Brake plate and steel plate and are activated when

e Park brake lever is pulled.


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PERATION

he torque converter is connected with a flywheel by a flexible plate,

ngine output is delivered from

e flywheel to the flexible plate.

he exterior of the torque converter is protected by the torque converterousing.

he torque converter housing forms the oil path for the oil pump, it

cludes the oil strainer filtering

ucked oil through this oil path and the oil level gauge measuring oil level

the transmission inside.


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Transmission

New Version Version


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The control valve consists of the main relief valve, inching valve,

accumulator valve and directional valve.

The discharged oil from the gear pump enters the main relief valve of the

control valve and the pressure is adjusted 10.8~14.9kgf/cm2

(154~212psi).

The Solenoid valves direct the oil pressure to Forward or Reverseclutches.

Power is transferred from the torque converter to drive axle through the

Forward or Reverse clutch direction.

The remaining oil pressure flows into the torque converter through the

input pressure control port.

At this time, the oil pressure input to the torque converter is adjusted

4~7kgf/cm2 (57~100psi), the oil pressure output from the torque converter

is adjusted below 7kgf/cm2 (100psi).

The oil which passes through the Torque Converter is directed to the

Transmission cooler where it is cooled before returning to the

Transmission to cool and lubricate the Clutches and the Bearings.

The pressure detecting valve and built in accumulator provide a soft

plugging when changing gears.

The pressure detecting valve allows the accumulator to absorb the small

shocks of rapid pressure build up and quick release during gear changes.

When full pressure builds up, the pressure detecting valve shuts the

accumulator off and allows it to empty, so it is ready to function again

during gear change.

The inching valve permits the clutch to partially disengage, so that enginerpm can be increased for lifting while travel speed remains low.

Hydraulic Diagram of the Control Valve


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Power Train Troubleshooting 1/4


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2/4


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4/4


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Inching Pedal and Linkage

Inching Pedal and LinkageThe brake pedal is used to actuate the hydraulic brakes on the

drive axle. At the beginning of the pedal stroke, the inching spool

of the transmission control valve is actuated to shift the hydraulic

clutch to neutral and turn off the driving force. By treading the

pedal further, the brake is applied.


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Adjusting the Inching Pedal


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Brake Valve


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Parking Brake


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Troubleshooting


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Steering System


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Operational Checks


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Hydraulic System (OPSS and Boosted Brakes)


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Pump Inlet Port to MCV


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Hoist Lift Circuit


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Hoist Lower Position


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Forward Tilt


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Tilt Backwards


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Lift Cylinder


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Tilt Cylinder


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Free Lift Cylinder


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Electrical


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Main Harness


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Frame/ Engine Part


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Component Specs


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Connector Destinations


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Connector Destinations


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Troubleshooting


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MAST


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(V) MAST

2 Stage


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(VF) MAST

2 Stage with Low Free Lift


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(TF) MAST

Three stage High Free Lift


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Chain Maintenance

Replacement

Replace chains as a pair. It will be virtually impossible to maintain uniform

loading between the strands if a new chain is put into service opposite an oldchain. The joints in the old chain will be greater than that on the new chain,

greatly complicating the problem of maintaining equal chain tension. The new

chain will wear more slowly causing it to bear the major portion of the load

resulting in premature wear and fatigue failure. Don’t steam clean or

decrease new chains, The manufacturer’s grease is effective in reducing wear

and corrosion. If the original factory lube is dried out or wiped off, soak the

new chain in heavy engine oil for at 1/2 hour prior to installing on truck. After

the old chains have been stripped from the mast, very carefully inspect chainanchors and chain wheel bearing. Broken, cracked or worn anchor must be

replaced using the new anchor pin and split pin. Do not paint newly replaced

chain after it has been installed.

Lubrication

The most important consideration in field maintenance of lift chains is

lubrication. Hard working, heavily loaded chains cannot be expected to givesatisfactory wear life without scheduled periodic re-lubrication. Like all

bearing surfaces, the precision manufactured, hardened steel, joint-wearing

surfaces require a film of oil between mating parts to prevent rapid wear. Oil

must penetrate the chain joint to prevent wear. Applying oil to external

surfaces will prevent rust, but oil must flow into the live bearing surfaces for

maximum wear life. Frequency of re-lube will vary with operating conditions

and environment, the best estimate of lube period is 200 hours. Trucks

parked outdoors or trucks in extremely severe service, may require morefrequent re-lube to maintain an oil film on all chain surface.

Wipe off the old oil with a clean cloth and blow out the remaining dirt with

compressed air.

NOTE

Wear eye protection.

With a clean brush, apply EP-140 extreme pressure lubricant or heavy

motor oil(40W).


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Chain Maintenance

Adjustment

•Chain adjustments are important for the following reasons

•Equal loading of chain.

•Proper sequencing of mast.

•Prevent over-stretching of chains.

•Prevent chains from jumping off sheaves if they are too loose.

Adjustment procedure

•With mast in its fully collapsed and vertical position, lower the fork to the

floor.

•Adjust the chain length by loosening or tightening nut on the chain anchor

After making adjustment on the mast, be sure to tighten the nut.


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Carriage, Backrest and Fork


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Troubleshooting Mast


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Troubleshooting Forks


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Operational Checks


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V & VF Mast Adjustment


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TF Mast Adjustment


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Roller Clearance


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Carriage Load Roller Adjustment


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Mast Back Up Liner

Hyundai Diesel Models New Transmission 2010-2011

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