Service Information

Document Title: Function Group: Information Type: Date:Hydraulic transmission, description

421 Service Information 8/4/2016 1

Profile:L60F Volvo

Hydraulic transmission, descriptionGeneral

Hydraulic transmissions HTE110 (L60F), HTE120 (L70F) and HTE125 (L90F) are hydromechanical transmissions. They have torque converter, reduction gears, and hydraulically controlled disc clutches. They have four gears forward and four gears inreverse. The clutch hubs for the different gears rotate freely on the clutch shafts. When a gear is engaged, then the clutch hub that is transmitting power mechanically connected with respective clutch shaft of the hydraulically affected disc clutches. The mechanical power transmission in the hydraulic transmissions takes place via gears in constant mesh. Gearshifting take place without any rim pull loss (Power Shift).The clutch events, controlled by the V-ECU, control oil flow and fill times for the clutches.

Component position

Figure 1

1.2.3.4.5.6.7.8.

SE2704, engine speedGear selector unitPWM valvesLifting eyeOil suction pipePressure check connectionShaft F, output power rearMagnetic plug

Figure 2

1.2.3.4.5.6.7.8.9.

10.

Axis BShaft DShaft CShaft H, power take-off hydraulicsSE4307 output speedSE4213, turbine speedValve housingShaft F, output power forwardShaft EShaft G

Figure 3

1.2.3.4.

Pressure check connection, reverse (R)Pressure check connection, 4th gear (4)Pressure check connection, forward (F)Pressure check connection, 2nd gear (2)

5.6.7.8.9.

10.11.12.

Pressure check connection, 1st gear (1)Pressure check connection, 3rd gear (3)PWM-valve, 1st gear (SB)PWM-valve, 3rd gear (SF)PWM-valve, 2nd gear (SC)PWM-valve, forward (SA)

PWM-valve, reverse (SD)PWM-valve, 4th gear (SE)

Figure 4

1.2.3.4.5.6.7.8.

Lube oil pressureTorque converter pressureMain pressureSE4903, temperatureSE4901, pressureConnection, suction pipeFilter connectionPump

APS

The function controls gearshifting based on the current operating situation[1] which gear is to be used and when shifting is to �

take place to protect the transmission.With the mode selector, the operator can select different shifting programs depending on the operating conditions.

L The machine shifts automatically at low engine rpms and low speed.

M The machine shifts automatically at higher engine rpms than at L.

H The machine shifts automatically at higher engine rpms and speed than at M.

AUTO The machine shifts automatically and selects shifting program for optimal comfort and economy.

SERVICE The gears are shifted manually.

Input signals Conditions for output functions Output functions

Manual shifting– Mode selector in mode SERVICE– Selected directional gear– Selected speed gear

– Directional gear F–N–R– Speed gear 1–4

– Gear selector travel direction, SW4205– Gear selector, SW4206– Mode selector, SW4212– Kick-down– Transmission disengagement– Engine brake, SW4210– Engine speed, SE2701– Travel speed, SE4307– Brake pressure, SE5205

Automatic shifting– Mode selector in position L–M–H or AUTO– Selected directional gear– Engine speed– Speed

– Directional gear F–N–R– Speed gear 2–4

Manual kick-down– Kick-down activated– Speed– Time

– Kick-down (downshifting to first gear)

Transmission disengagement– Transmission disengagement requested– Applied brake

– Transmission disengagement (neutral gear)

Engine brake– Engine brake in position On

– Engine brake when throttle pedal is released (downshifting to next gear)– Prevents upshifting when increasing throttle

Protective functionsOverspeed protection of transmission in active gear by upshifting to the next gear in case rpm for the protective function is exceeded. Shifting points vary depending on if the engine is pulling or braking.Warning for overspeed of transmission in active gear.

Automatic shifting with manual kick-downShifting is handled automatically. Conditions for shifting is a combination of the mode selector's setting, engine rpm, and machine speed. In AUTO-mode, consideration is also given to operating cycle. Automatic shifting takes place between gears 2–4.Downshifting to 1st takes place after kick-down has been activated with any of the kick-down controls and if output rpm is within 1st gear's rpm range within 8 s.Upshifting to 2nd takes place if:Directional gear is changed.Any of the kick-down controls are pressed down after 3 s and if speed exceeds 1st gear.If speed exceeds 1st gear after 5 s.

Automatic shifting with Fully automaticSame conditions as for APS plus automatic kick-down if the button Fully automatic, SW4211, is activated. Manual kick–down isnot changed when automatic kick-down, AKD, is activated. AKD is only used when directional gear is in position F. If the button for kick-down (kick-up) is pressed after AKD-shifting to 1st has taken place, upshifting is prevented for 3 s. Time count for lock-out time starts immediately after AKD has downshifted to 1st gear.

Transmission slipping

The function monitors and informs the operator if clutches slip during normal operation. The signal comes from the APS-function. If slipping continues for more than 0.5 s, then “Engine Shut Down will be activated.

Transmission disengagement

Selection of the function transmission disengagement is moved to the information display unit from and incl. introduction of fully automatic (APS).

Input signals Conditions for output functions Output functions

– Transmission disengagement in position On– Output brake pressure > 1.8 MPa (18 bar) (261 psi)

– Transmission disengagement– Output brake pressure, SE5205– Transmission disengagement, via information display unit

– Transmission disengagement in position Off– Output brake pressure < 1.8 MPa (18 bar) (261 psi) or

– No transmission disengagement

Speed limitation

The function limits the vehicle speed to governing legal max. speeds. Setting of speed for speed limitation is done with VCADS Pro.

Input signals Conditions for output functions Output functions

– VCADS Pro parameter HLA "OFF"– Speed

– No speed limitation– VCADS Pro parameter HLA– Speed

– VCADS Pro parameter HLA– Speed

– Speed limitation to selected speed (20, 30, or 40 km/h)

Back-up alarm

The function informs bystanders and surroundings that the machine is reversing.

Input signals Conditions for output functions Output functions

– Directional gear – Directional gear in position reverse – Back-up alarm SA3603

Transmission oil pressure

The function monitors the main oil pressure in the transmission and informs the operator in case of low transmission oil pressure or if there is a system failure. Monitoring gives consideration to limited pump capacity at low engine speeds and when filling clutches at gearshifting.See also: Wiring diagram 403

Input signals Conditions for output functions Output functions

– Upon starting, no alarm is given for 5 seconds after the engine has startedAlarm limits for transmission oil pressure:1. < 0.3 MPa (43.5 psi) at 600 rpm2. < 1.3 MPa (188.5 psi) at 1200 rpm3. < 1.5 MPa (217.6 psi) at 2400 rpm– When engine speed is below alarm limit 2, transmission pressure is not monitored for 3 seconds– When engine speed is above alarm limit 2, transmission pressure is not monitored for 2 seconds

– Warning light– Red central warningWarning– Low transmission oil pressure

– Transmission oil pressure, SE4901– Engine speed, SE2701– Directional gear

According to above as well as: Directional gear in position Forward or Reverse

– Buzzer

– Monitoring, SE4901 – See guided diagnostics.

Transmission oil temperature

The function monitors transmission oil temperature and informs the operator in case of too high temperature or if there is a system failure. If transmission oil temperature increases even higher, the function “Engine Shut Down is activated to limit engine speed.See also: Wiring diagram 403

Input signals Conditions for output functions Output functions

– Transmission oil temperature above 110 °C (230 °F) > 2 seconds– High transmission oil temp. is active until the temperature drops > 2 °C (1.8 °F) below the temperature condition for > 2 seconds

Warning– High transmission oil temp.

– Transmission oil temperature, SE4903

– Transmission oil temperature above 120 °C (248 °F) > 2 seconds– Engine Shut Down is active until the temperature drops > 2 °C (1.8 °F) below the temperature condition for > 2 seconds

Warning– High transmission oil temp.– Engine Shutdown

– Monitoring, SE4903 – See guided diagnostics.

Gear selector

This function co-ordinates the three gear selectors for travel direction and informs the operator about which control is active and if there is a system failure.This function means that Forward/Reverse shifting can be performed using the gear control located in the steering column, lever carrier, or armrest depending on which control is active. Kick-down can be activated with one of the three Kick-down controls regardless of active gear control. For Kick-down on the armrest to work, the armrest must be lowered.Priority of the gear selectors means that if a gear selector with higher priority than the active gear selector is activated, the gear selector with lower priority is deactivated.1. Gear selector, steering column2. Gear selector, CDC3. Gear selector, lever carrier (hydraulic and electric version) or gear selector, single leverSee also: Wiring diagram 407Wiring diagram 408Wiring diagram 912

Input signals Conditions for output functions Output functions

Activation Comfort Drive Control (CDC)– Engine On

– Activation gear selector lever steering (CDC)

– Gear selector steering column, SW4205

– Speed < 5km/h (3 mph)– Gear selector steering column in position N– Armrest, active (lowered)– Gear selector lever steering in position N– Control activation lever steering in position On

– Control light lever steering (CDC)– Gear selector steering column, SW4206– Gear selector lever steering, SW4217– Gear selector lever carrier, SW4208

– Single lever (joystick), SW4221– Activation lever carrier, SW4207– Activation lever steering, SW4216– Kick-down lever carrier, SW4209– Kick-down lever steering, SW4220– Armrest position sensor, SE4218– Engine On/Off– Speed

Deactivation of lever steering (CDC) takes place if any of the functions below are activated– Gear selector steering column in position F or R– Armrest inactive (raised)– Engine Off and speed < 5 km/h (3 mph)

– Deactivation gear selector (CDC)– Activation gear selector lever carrier (F/R)

Activation of lever carrier (F/R)– Engine On– Speed < 5 km/h (3 mph)– Gear selector steering column in position N– Armrest inactive (raised)– Gear selector F/R gear carrier in position N– Control activation F/R lever carrier in position On

– Activation gear selector lever carrier (F/R)

Deactivation of lever carrier (F/R) takes place if any of the following functions are activated.– Gear selector steering column in position F or R– Engine Off and speed < 5 km/h (3 mph)– Armrest, active (lowered) and control activation Lever steering in position On

– Deactivation of gear selector lever carrier (Lever carrier deactivated)– Activation gear selector lever steering (CDC)– Control light lever steering (CDC)–

Activation of single lever (joystick)– Engine On– Speed < 5 km/h (3 mph)– Gear selector steering column in position N– Armrest, inactive (raised)– Single lever in position N– Control activation F/R lever carrier in position On

– Activation single lever (F/N/R)

Activation of kick-down takes place if any of the following functions are activated.– Control Kick-down steering column– Control kick-down lever carrier– Control Kick-down lever steering (if lever steering is installed)

– Request for kick-down

– Monitoring, SW4206, SW4208, SW4217, and SW4218

– See diagnostics

[1]Current operating situation means current engine rpm, output speed, selection of directional gear, speed gear, kick-down, and engine braking.