Mercedes-Benz L 710

Mercedes Benz
L 710
L 710
Manufacturer:	Daimler Benz
Sales designation:	L 710 (from 1963) L 323 (to 1963)
Production period:	1961-1970
Previous model:	L 311
Successor:	none
Technical specifications
Designs:	Short-nosed trucks with different bodies and front control arms
Engines:	OM 312 and OM 352 (both diesel, 4580–5675 cm³)
Power:	74 kW
Length:	5445-7875 mm
Width:	2280-2500 mm
Height:	2355-2460 mm
Wheelbase:	3200-4830 mm
Turning circle:	ø 12.6–17.9 m
Payload:	3.27-4.51 t
Perm. Total weight:	7.4-7.49 t

The Mercedes-Benz L 710 is a two-axle short- nosed truck of the Mercedes-Benz brand , which was built in the Mercedes-Benz plant in Mannheim from 1961 . From 1961 to 1963 the vehicle was called the L 323 . The L 710 is the smallest Mercedes-Benz short-nosed truck , but it was also built as a forward control . The all-wheel drive models, which were only introduced later, were only delivered from the factory as a tipper or chassis, but not as a flatbed truck.

Model overview

• L 710: basic model, platform, rear-wheel drive
• LK 710: tipper, rear-wheel drive
• LA 710: chassis, all-wheel drive
• LAK 710: tipper, all-wheel drive
• LS 710: tractor, rear-wheel drive
• LP 323: front control, rear-wheel drive
• LPS 323: front-link tractor, rear-wheel drive

• 

  L 323

• 

  LA 710

• 

  LP 323

technology

Chassis and power transmission

The L 710 is a two-axle truck with a ladder frame and rigid front and rear axles . Four different wheelbases were offered, from 3200 to 4830 mm. The axles are each suspended on two semi-elliptical leaf springs, the rear axle is also provided with two progressive auxiliary springs, while the front axle also has telescopic shock absorbers . The front axle has single tires, the rear axle is equipped with twin tires. The wheels are steel disc wheels. The tires of size 7.5-20 are mounted on split tapered shoulder rims of size 6.0-20. In addition to Daimler-Benz itself, the suppliers for the brake system were Bosch and Teves. The brake system is a hydraulic brake system with a single-chamber compressed air brake aid, the braking force acts on brake drums with a diameter of 400 mm on all four wheels. The handbrake is mechanical and acts on the brakes on the rear wheels. The manufacturer of the steering is Daimler-Benz, it is a recirculating ball steering system with an undivided tie rod . All vehicles were available as both left-hand and right-hand drive.

The force from the engine via a single dry type Fichtel & Sachs H 32 transmitted to the transmission. The gearbox is an unsynchronized five-speed gearbox from Daimler-Benz that is interlocked with the engine. It is shifted with a shift lever located next to the driver's seat. Later, only a fully synchronized gearbox with five gears was available. The drive force is transmitted from the gearbox via a two-part cardan shaft to a bevel gear axle drive with palloid teeth , which transmits the power to the rear axle. All-wheel drive models have three cardan shafts as a power transmission element.

Engines

OM 312

The engine is in the first vehicles of the Mercedes-Benz OM 312 , a standing rows - six cylinder - four cycle - Diesel engine having two valves , indirect injection and water cooling . The cylinder block made of alloyed gray cast iron and the split crankcase are made from a single cast. With a cylinder bore of 90 mm and a piston stroke of 120 mm, the engine has a total displacement of 4580 cm³. Forged pistons made of light metal from Mahle , each with four compression rings and two oil control rings, run in the cylinders . The first compression ring is chrome-plated. The force is transmitted via diagonally split connecting rods made of heat-treated steel with a double-T cross-section to a forged crankshaft with seven bearings, hardened at the bearings. The connecting rod and crankshaft have lead bronze plain bearings with steel support shells. The crankshaft is fitted with vibration dampers.

A camshaft made of heat-treated steel with four bearings in plain bearings runs in the crankcase and is driven by helical spur gears. It operates the hanging valves via bumpers and rocker arms . Each cylinder has an inlet and an outlet valve. The gray cast iron cylinder head, which covers all cylinders, has a cylinder head gasket that contains asbestos .

The pressure circulation lubrication works with a gear oil pump in the oil sump and an oil filter in the main flow. The fuel is cleaned through a felt tube filter and injected into the prechambers with a Bosch PES 6 A70 B 410 RS 64/7 injection pump through Bosch DNO SD 211 injection nozzles. The injection pump has a centrifugal governor. The air is cleaned with an oil bath air filter, the suction pipe is led through the cylinder head cover from above. The engine is cooled with a tube cooler, the warm exhaust air of which is blown away by a fan.

OM 352

→ Main article : Mercedes-Benz OM 352

The OM 312 was replaced by the OM 352 during production. The OM 352 is also a series - six cylinder - four cycle - Diesel engine having two valves , and water cooling , substantial difference from the OM 312 is adjacent to the larger displacement, the direct injection into the piston recess. The engine's cylinder block is cast from molybdenum-chromium alloyed special cast iron, the crankcase is made from alloyed special gray cast iron. With a cylinder bore of 97 mm and a piston stroke of 128 mm, the engine has a total displacement of 5675 cm³. The pistons are forged pistons made of light metal from Mahle , each with three compression rings and two oil control rings . The force is transmitted via diagonally split connecting rods made of heat-treated steel with a double-T cross-section to a forged crankshaft with seven bearings, hardened at the bearings. The connecting rod and crankshaft have three-component bearings with steel support shells. The crankshaft is equipped with counterweights and vibration dampers.

A camshaft made of hardened heat-treatable steel with four bearings in plain bearings runs in the crankcase and is driven by the crankshaft via helical spur gears. It operates the hanging valves via bumpers and rocker arms . Each cylinder has an inlet and an outlet valve. The cylinder head made of molybdenum-chromium alloy special cast iron, which covers all cylinders, is sealed off from the cylinder block with an asbestos-containing cylinder head gasket.

The pressure circulation lubrication works with a gear oil pump in the oil sump and an oil filter in the main flow and an oil filter in the bypass flow. The fuel is cleaned through a felt tube filter and injected into the piston bowls with a Bosch PES 6 A70 C 410 RS 2085 injection pump through Bosch DLLA 150 S 187 injection nozzles . The injection pump has a centrifugal governor. The air is cleaned with an oil bath air filter. The engine is cooled with a tube cooler, the warm exhaust air of which is blown away by a fan.

Technical specifications

1961

Parameters	L 323			LK 323	LP 323				LPS 323		LS 323
Dimensions and weights
Wheelbase (mm)	3600	4200	4830	3600	3200	3600	4200	4830	3200	3600	3200	3600
Length (mm)	6175	6875	7875	6045	6330	7330	7725	8825	5655	6055	5445	5845
width (mm)	2340				2500						2340
Height (mm)	2355				2455						2355
Front track (mm)	1905
Rear track (mm)	1705
Ground clearance (mm)	240
Turning circle diameter (m)	13.6	15.2	16.9	13.6	12.8	13.9	15.5	17.2	12.8	13.9	12.6	13.6
Empty weight kg)	3350	3430	3560	3870	3430	3500	Depending on the structure		2895	2925	2935	2955
Payload (kg)	4050	3970	3840	3530	3970	3900			4505	4475	4465	4445
Maximum permissible total weight (kg)	7400
Powertrain
coupling	Single-disc dry clutch Fichtel & Sachs H 32
transmission	Manual five-speed gearbox from Daimler-Benz, not synchronized
Drive on	Rear wheels
Gear ratios	1st gear: 7.37 2nd gear: 4.23 3rd gear: 2.49 4th gear: 1.56 5th gear: 1.00 R. gear: 7.15
Translation from the gearbox to the rear axle	5.72
Top speed (km / h)	88.7
Effective total braking area (cm²)	2005
engine
Engine type	Mercedes-Benz OM 312
Engine structure	Six-cylinder in-line four-stroke diesel engine
Mixture formation	Pre-chamber injection
Valve control	OHV valve control, two valves
cooling	Water cooling
Bore × stroke	90 × 120 mm
Displacement	4580 cc
Nominal power according to DIN 70020	100 DIN HP / 74 kW at 3000 min −1
Maximum torque according to DIN 70020	27 kpm / 265 Nm at 1600 min -1
Medium piston speed	12 m / s
Compression ratio	19.8: 1
Medium work pressure	726 kPa (7.26 bar)
Injection pressure	127-137 bar
Firing order	1-5-3-6-2-4
Inlet valve opens	29 ° before top dead center
Inlet valve closes	55.9 ° after bottom dead center
Outlet valve opens	51.4 ° before bottom dead center
Outlet valve closes	24.3 ° after top dead center
Engine ground	385 kg
Motor dimensions (length × width × height in mm)	927 × 660 × 1048
Oil consumption (ml / 100 km)	200
Fuel consumption according to DIN 70030 (l / 100 km)	14.5								Depending on the trailer
Filling quantities
Capacity of the fuel tank (l)	100
Oil pan capacity (l)	7-9
Capacity of the cooling system (l)	24				21st				24
Capacity of the gearbox housing (l)	3.7
Electrical system
Glow plugs	Heating power 36 W
Starter	12 V thrust armature starter Bosch BNG 4/12 CR 201 (electromagnetically operated)
alternator	Bosch LJ / GG 240 / 12-2400 R1 (12 V, 240 W) drive via V-belt from crankshaft speed of 928 min −1
battery	1 × lead acid accumulator 12 V, 135 Ah

1966

Parameters	L 710			LK 710	LA 710		LAK 710	LS 710
Dimensions and weights
Wheelbase (mm)	3600	4200	4830	3600	4200	3600
Length (mm)	6175	6875	7875	6045	6875	6175	6045	5720
width (mm)	2340				2380		2280	2250
Height (mm)	2355				2460			2400
Front track (mm)	1905				1890			1905
Rear track (mm)	1705
Ground clearance (mm)	240
Turning circle diameter (m)	13.6	15.2	16.9	13.6	17.9	15.9		13.6
Empty weight kg)	3350	3450	3550	3850	3775	3700	4220	2875
Payload (kg)	4140	4040	3940	3640	3715	3790	3270	4510
Maximum permissible total weight (kg)	7490
Powertrain
coupling	Single-disc dry clutch Fichtel & Sachs
transmission	G32 manual five-speed gearbox from Daimler-Benz, fully synchronized
Drive on	Rear wheels				All wheels			Rear wheels
Gear ratios	1st gear: 8.02 2nd gear: 4.769 3rd gear: 2.754 4th gear: 1.66 5th gear: 1.00 R. gear: 8.29
Translation from the gearbox to the rear axle	5.714				5.74		6.857	5.714
Top speed (km / h)	85.9				82.1		68.6	85.9
Effective total braking area (cm²)	2005
engine
Engine type	Mercedes-Benz OM 352
Engine structure	Six-cylinder in-line four-stroke diesel engine
Mixture formation	Direct injection
Valve control	OHV valve control, two valves
cooling	Water cooling
Bore × stroke	97 × 128 mm
Displacement	5675 cc
Nominal power according to DIN 70020	100 DIN-PS / 74 kW at 2900 min -1
Maximum torque according to DIN 70020	28 kpm / 275 Nm at 1600 min -1
Medium piston speed	12.4 m / s
Compression ratio	17: 1
Medium work pressure	608 kPa (6.08 bar)
Injection pressure	196 bar
Firing order	1-5-3-6-2-4
Inlet valve opens	29 ° before top dead center
Inlet valve closes	55.9 ° after bottom dead center
Outlet valve opens	54 ° before bottom dead center
Outlet valve closes	20.8 ° after top dead center
Engine ground	410 kg
Oil consumption (ml / 100 km)	200
Fuel consumption according to DIN 70030 (l / 100 km)	12.5				13.7			Depending on the trailer
Filling quantities
Capacity of the fuel tank (l)	100
Oil pan capacity (l)	7-9
Capacity of the cooling system (l)	24
Capacity of the gearbox housing (l)	3.7
Electrical system
Starter	12 V thrust armature starter Bosch 0001401049 (electromagnetically operated)
alternator	Bosch LJ / GG 240 / 12-2400 R16 (12 V, 240 W) drive via V-belt from crankshaft speed of 928 min −1
battery	1 × lead acid accumulator 12 V, 143 Ah

literature

• Association of the Automotive Industry : Daimler-Benz AG. Mannheim plant: Type L 323 and LK 323 Group 14, number 740. Frankfurt am Main. November 1961.
• Association of the Automotive Industry : Daimler-Benz AG. Mannheim plant: Type LP 323 Group 14, number 740a. Frankfurt am Main. November 1961.
• Association of the Automotive Industry : Daimler-Benz AG. Mannheim plant: Type LPS 323 Group 15, number 740a. Frankfurt am Main. November 1961.
• Association of the Automotive Industry : Daimler-Benz AG. Mannheim plant: Type LS 323 Group 15, number 740. Frankfurt am Main. November 1961.
• Association of the Automotive Industry : Daimler-Benz AG. Mannheim plant: Type L 710 and LK 710 Group 14, number 749. Frankfurt am Main. December 1966.
• Association of the Automotive Industry : Daimler-Benz AG. Mannheim plant: Type LA 710 group 14, number 749a. Frankfurt am Main. December 1966.
• Association of the Automotive Industry : Daimler-Benz AG. Mannheim plant: Type LAK 710 Group 14, number 749b. Frankfurt am Main. December 1966.
• Association of the Automotive Industry : Daimler-Benz AG. Mannheim plant: Type LS 710 Group 15, number 749. Frankfurt am Main. December 1966.

Individual evidence

1. ↑ ^{a b} Wheelsage: L 710 ( Memento from May 11, 2016 in the Internet Archive )
2. ↑ ^{a b} Mercedes-Benz: Short bonnet, long life: the so-called short-nosed truck models from Mercedes-Benz made commercial vehicle history between 1959 and 1996.

Web links

Commons : Mercedes-Benz L 710  - Collection of pictures, videos and audio files