Schwing SP 750-18 - Hydraulic System Adjustments and Procedures

105
Maintenance
SP 500 / 750-15 / 750-18 / 1000 / 1250 Operation Manual
Annual maintenance
Change hydraulic oil for age reasons
Change hydraulic oil annually. If you have recently
changed the hydraulic oil because of changing weather
conditions, you can ignore this procedure. The same
lling rules that apply to adding hydraulic oil apply to
lling the tank after draining and cleaning. Use the fol-
lowing procedure to change the hydraulic oil:
1. The engine must be shut o󰀨. Put the key in your
pocket.
2. The oil should be cool. This is for safety reasons.
Do not change oil that is above 120°F (50°C).
3. Drain the old oil into barrels or another waste
oil receptacle. The oil can be pumped out of the
inspection cover on the top of the tank, or be
drained out of the bottom of the tank.
4. Once the oil is drained, clean the tank through
the inspection cover, using cleaning solvent and
lint-free rags. Do not use gasoline! Remove all silt
from the bottom of the tank.
5. Close the drain, if open. Rell by pumping new
hydraulic oil out of the barrels with a lter cart. If
no cart is available, rent one.
Unltered new hydraulic oil is not clean enough
to install in your unit. Filter oil to meet ISO 4406
code 18/16/13.
6. If you ignore this step, you may begin having trou-
ble with pumps and valves immediately or with-
in the rst few days. See the information at the
beginning of this chapter for specic information
about hydraulic oils that are approved for use in
Schwing machines.
7. Change the main return lter before restarting the
unit. See “Change hydraulic oil return lter” on
page 104.
Unscheduled maintenance
The following items will have to be maintained on your
pump. The time of service that you get from these parts
varies dramatically from unit to unit because of the wide
range of applications to which these machines are sub-
jected. Di󰀨erences in concrete and pressure play a ma-
jor role in the wear of these components.
Changing rams
When you begin to see small bits of sand or pebbles in
your waterbox at the end of the day, it is time to change
the rams.
To assist in ram replacement, Schwing o󰀨ers a Ram
Change Mode feature. This feature drops engine
RPM’s and stroke limiter outputs to minimal levels. The
di󰀨erential cylinders will now move as slow as possible
allowing the operator to easily position the rams inside
the waterbox for replacement.
When changing rams, you will have to put your hands
in the waterbox on several occasions. You must stop
the engine each and every time before putting your
hands into the waterbox.
Ram Change Mode
To activate Ram Change mode, press
the ram change button located next to
the waterbox. When pressed, engine
RPM’s and stroke limiter outputs will be
reduced to minimal levels. You must use
the cable remote to control the concrete pump forward
and reverse. All other functions on the rear operator
panel keypad or cable remote will be disabled. Once
enabled - you can only deactivate Ram Change Mode
by shutting o󰀨 the engine and restarting the machine.
Ram Change Mode ButtonE-Stop Button
Figure 15
Ram Change Mode button