Check lubrication oil pressure · ar2645w0052a · Mercedes-Benz WIS

AR26.45-W-0052A

Check lubrication oil pressure

16.2.07

TRANSMISSION 715.500 /507 /510 /513 /517 /520 /527 /540 with CODE (N56) Transmission independent power take-off (NMV) i = 1.48

TRANSMISSION 715.500 /507 /510 /513 /517 /520 /527 /540 with CODE (N57) Transmission independent power take-off (NMV) i = 1.09

W26.45-1062-06

NMV shift pattern switched off

1 Pressure regulator valve

2 Pressure limitation valve with pressure regulator valve

3 4/2 directional control valve in pressure control valve

4 Oil filter (cartridge)

5 Bypass valve

6 Pressure limiting valve

7 Oil filter (metal sieve)

8 Output shaft

9 Oil pump

10 Hollow shaft

11 Intermediate gear

12 Driven gear

13 External plate carrier

14 External plate carrier

15 Shift piston

16 Shift cylinder

17 Compression spring

Z Compressed air connection

M1 Test connection for shift oil pressure

M2 Test connection for the lubricating oil circuit for the gears

K Pressure line for shifting the multi-disk clutch

P Pressure line from oil pump

R Return flow pipe

S1/

S3 Lubrication oil circuit for gears

S2 Lubrication oil circuit for multiple-disc clutch

W26.45-1076-01

M2 Test connection for the lubricating oil circuit for the gears

W26.45-1059-10

Lubrication pressure graph

A Oil temperature approx. 35 °C

B Oil temperature approx. 80 °C

 If the lubrication oil pressure exceeds 6 bar, it is no longer possible to switch on the live power take-off.

Modification notes

7.2.07

Work sequence changed.

	Check
1	Unscrew the screw plug on the test connection for lubricating oil for the gears (M2) and connect the test pressure gauge		*123589042100
2	Start engine and allow to idle
3	Switch off the live power take-off
4	Read off and note the engine speed on the tachometer and the lubrication oil pressure on the test pressure gauge when the live power take-off is switched off	 If possible check the lubrication oil pressure at a transmission oil temperature of approx. 80 °C.
5	Compare read off values with the specified values:	Lubrication oil pressure at oil temperature of 35° C, NMV switched off and at an engine speed of 1000 rpm	*BE26.45-N-1006-01B
		Lubrication oil pressure at oil temperature of 80 °C, NMV switched off and at an engine speed of 1000 rpm	*BE26.45-N-1007-01B
		 If the specified values are exceeded, check the live power take-off with the aid of the shift diagram.
6	Switch on live power take-off (NMV)	 After switching on NMV, engine runs at the working speed programmed in the PSM.
		If the lubrication oil pressure exceeds 6 bar, it is no longer possible to switch on the live power take-off.
7	Read off and note the engine speed on the tachometer and the lubrication oil pressure on the test pressure gauge when the live power take-off is switched off	 If possible check the lubrication oil pressure at a transmission oil temperature of approx. 80 °C.
8	Compare read off values with the specified values:	Lubrication oil pressure at oil temperature of 80° C, NMV switched on and at an engine speed of 1000 rpm	*BE26.45-N-1008-01B
		 If the specified values are exceeded, check the live power take-off with the aid of the shift diagram.
9	Detach test pressure gauge and install the screw plug	 Use new sealing ring.

Test values for PTO

Number	Designation		Transmissions 715.500/507/510/513/ 517/520/ 527/540 with code N56, N57 (NMV)


BE26.45-N-1006-01B	Lubrication oil pressure at oil temperature of 35° C, NMV switched off and at an engine speed of 1000 rpm	bar	5,5
BE26.45-N-1007-01B	Lubrication oil pressure at oil temperature of 80 °C, NMV switched off and at an engine speed of 1000 rpm	bar	2,8
BE26.45-N-1008-01B	Lubrication oil pressure at oil temperature of 80° C, NMV switched on and at an engine speed of 1000 rpm	bar	1,0

Testing unit

123 589 04 21 00