Preliminary work: Leveling valve pressure test 34

Preparation for Test

1. Check oil level in oil reservoir, correct if necessary. 2. Disconnect connecting rods (54, 55) at front and rear leveling valve levers (set levers to neutral position). 3. Disconnect leak oil line of suspension strus at front axle and close steel line. 4. Disconnect return line (T) at oil reservoir.

Test step	Test scope	Test connection	Test condition	Nominal value	Possible cause/Remedy
1.0	Valve assembly internal leakage	--	Engine: at Idle Set front axle leveling valve lever to "F" (fill). Then move leveling valve lever to center position. Set rear axle leveling valve lever to "F" (fill). Then move leveling valve lever to center position. Engine: OFF Wait at least two minutes (allows valves to close). Move both leveling valve levers to "L" (empty).	Vehicle must raise at front axle. Vehicle must raise at rear axle. Vehicle must not lower.	Replace distributor valve or valve assembly. Replace distributor valve or valve assembly. Replace distributor valve or valve assembly.
	Leak oil discharge	--	Disconnect return line (T) at reservoir. Attach drain hose and place into measuring container.	Maximum of 2 cc oil discharge in four hours.	Replace distributor valve or valve assembly.