RE 15345-WA, Version 11.2022, Bosch Rexroth AB
Maintenance and repair |
Drive system Hägglunds Fusion 59/72
9.8 Drive system out of service
Periods out of service
1. Check system for leaks
. All system pipe joints and rotating seals are to be
checked to find if any leaks exists. Leaking pipe joint shall be immediately
corrected, if possible by tightening. Joints that repeatedly continue to show
leakage are to be replaced during off-season maintenance. Leaking rotating
shaft seals are remarked in logbook and corrected during the off-season
maintenance. A corrective action has to be verified under operation, which
means that checking of leaks preferably is done two to three weeks in advance
of shut down.
2. Topping up system oil
. If necessary system oil shall be filled before the system
is shut down for the off-season stop. Doing so means that the oil is well
cleaned trough filters before shut down and reservoir bottom silt is avoided.
Note!
When system oil is filled, always use the drive system filling connection.
3. Air bleeding.
To avoid internal corrosion ensure that components are oil filled.
With the hydraulic pump in idling it is recommended to air bleed the pump as
well as the hydraulic motor casings in conjunction with the final stop. The pump
air bleeding is done at the upper most drain port (T2) on the pump casing
by slowly open the hose connection nut and keep open until a smooth oil
flow is coming through the threads. Air bleeding can be substituted by adding
vapour active anti corrosion agent in to the oil before the planned shutdown.
Introduction of such additive shall be done a couple of weeks in advance
to the stop. Quantities to be added shall be in accordance with supplier‘s
recommendation.
4. Stopping the drive system.
Final shut down is carried out as any normal drive
stop only with the exception that before the pump is stopped, in idling mode,
the cooling water supply is cut. With this sequence, any risk for cooling water
to entrain the oil through the cooler is avoided due to the higher pressure in oil
circuit.
5. Check of water in oil.
To check status of cooler water leakage, drain some
quantity of oil from the tank bottom using the drain cock valve located at tank
front. If any water or milk similar oil drain from the tank, it is necessary to
locate the leak and correct before next start. If such quantities of water are
found, change of oil may also be required.
Take an oil sample to check the condition of the oil, see section
6.
Change of filters.
The hydraulic drive is equipped with different filters for
hydraulic oil and air breathing of tank. None of these filters are cleanable
and has to be changed, see
In conjunction with changing filter,
inspection of the same can be used to monitor status on pump and motor. If
the filter surface shows high quantity of wear debris, the reason for this shall
be located and corrected. If the debris appears grey, the hydraulic motor wears
extensively. Yellow or bronze debris indicates wear in the hydraulic pump.
7. Cleaning of coolers.
Clean the coolers acc to section
8. Electric motor lubrication.
Lubricate acc to section
