Cooler - Bosch Rexroth Hagglunds DUc MS2 Installation & Maintenance Manual

Maintenance and repair | Hägglunds DUc Drive unit

9.7 Cooler

9.7.1 Cleaning
The cooler has to be cleaned when the temperature in the hydraulic system is
above specified limits due to low cooling capacity.
Before cleaning:
• Stop the Drive Unit
• Disconnect the cooler from the main power supply
Improper handling
Environmental risk
▶ Follow the safety precautions on the container of the cleaning agent used
▶ Cleaning agent and waste water from rinsing should not be desposed in nature
Air-oil cooler
Hot cooler
Risk of burnes
▶ Make sure that the air-oil cooler has cooled down
Side of air fins
• The air fins can be cleaned with compressed air. If seriously soiled, cleaning
should be done by means of a highpressure cleaner and degreasing agent. The jet
should be kept carefully and in parallel with the air fin.
Oil side of cooling element
• The oil side of the cooling element is cleanded by flushing with a degreasing
agent. Afterwards flush with the fluid/medium which is used later.
Water-oil cooler, plate type
Back-flushing with water will remove most soft deposit.
• If fouling appears in the form of hard deposits, circulate a weak acid through the
cooler in reverse direction to the normal waterflow. Use 5% phosphoric acid or,
for frequent cleaning, 5% oxalic acid or similar weak organic acid. Afterwards
rinse with a large quantity of water to flush all acid from the cooler before
starting up the system again.
Never wait until the cooler is completely clogged before cleaning.
Note! To clean the water-oil cooler water valve must be opened, see 9.7.2
NOTICE
CAUTION
RE 15326-WA, Version 06.2020, Bosch Rexroth AB
73/88