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Hägglunds DUc Drive unit
| Maintenance and repair
Bosch Rexroth AB, Version 06.2020, RE 15326-WA
General
The intention is to verify the condition of the oil during operation. The motors
should be running at normal operation while the sample is taken.
The cleanliness is extremely important during sampling.
Always use bottles adapted to oil samples, they can be ordered from any fluid
analysis laboratory.
Never try to clean your own bottle if you want a true value of the result.
The sample should be taken by using a mini-mess hose connected to a mini-mess
coupling.
Always clean the connections carefully before you connect the mini-mess hose to
the coupling.
Check and be aware of the pressure you may have on the connection before you
connect.
Be careful when connecting the mini-mess hose because the oil beam can be
dangerous and should never point against any person or other sensible object.
Bottle samples
The sample shall be taken at the mini-mess coupling on the low pressure side of
the motor in the main loop. Never take the sample out of the tank using the ball
valves.
Clean the coupling and the hose carefully.
Connect the mini-mess hose to the coupling but be careful and be aware of the
direction of the oil beam.
Let minimum 2 l (0,53 gal) of oil flush into a bucket before you fill the bottle.
Remove the cap of the bottle as late as possible and avoid any contamination to
be in touch with the cap, bottle or mini-mess hose when the sample is taken.
To get a reliable result the system must run without moving any valves and the
mini-mess hose should not touch the bottle.
Only ¾ of the bottle shall be filled because the laboratory has to shake the sample
to get a mixed fluid when they analyse it. Minimum 0.2 l (0,053 gal) are needed for
a good analysis.
When the bottle is filled close the cap as soon as possible to prevent
contamination from the air to enter the bottle and give wrong result.
Inline measure
The measure can be taken at the mini-mess coupling on the pump low pressure
side of the main loop system (MB or MA port depending on the main flow
direction). Return flow can be connected to the mini-mess coupling on the pump
T(D) port. Clean the couplings and the hoses carefully before connection.
Connect the hoses according to the particle counter manual.
To get a true value of the contamination, readings have to be stable for 10 min.
9.5
Air filter breather change
1.
Clean the area around the air filter breather. See
2.
Remove the existing filter and dispose according to environmental regulations.
3.
Mount a new filter and make sure no foreign material has entered the oil tank.
