Hardi Commander Twin Force Plus, Instruction Book

Page: 70 / 94

70
GB 14 08 01
Maintenance
V V V V Venting the hy enting the hy enting the hy enting the hy enting the hydr dr dr dr draulic damping sy aulic damping sy aulic damping sy aulic damping sy aulic damping system stem stem stem stem
(SELF TRA (SELF TRA
(SELF TRA (SELF TRA
(SELF TRACK only) CK only)
CK only) CK only)
CK only)
The following venting procedure requires a special
venting kit, HARDI ref. no. 720725.
1. Place the trailer on the support leg so that the yoke
goes free from the tractor and the rams can work
freely.
2. Relieve the pressure in the expansion tank and
remove the hydraulic hose.
NOTE! Plug the hose. If this is neglected, the pressure
gauge may be damaged.
3. Fit the two test hoses in the pressure gauge outlets on
the rams (at the rear of the track system).
4. Move the track system from one side to the other
approx. 10 times (full swing).
5. Loosen the plug very carefully in order to leak the air
out of the system.
6. Fit the hydraulic hose on the expansion tank.
7. Remove the level plug and using the tractor hydrau-
lics, cautiously fill oil in the expansion tank until it
reaches the level plug.
8. Fit the level plug and fill the expansion tank to an air
pressure of 5 bar.
9. Fit the 0-400 bar pressure gauge on the pressure
gauge outlet at the ram. Adjust the excess-pressure
valve to approx. 40 bar.
On flat ground it is possible to work with a lower opening
pressure. This gives a more sensible reaction but it also
results in the fact that the trailer can swing when driving
on hilly ground and when swinging at high speed.
TRA TRA TRA TRA TRACKER damping pr CKER damping pr CKER damping pr CKER damping pr CKER damping pressur essur essur essur essure setting (SELF e setting (SELF e setting (SELF e setting (SELF e setting (SELF
TRA TRA
TRA TRA TRACK only)
CK only)
CK only) CK only) CK only)
The hydraulic pressure relief valves in the TRACKER’s
damping system is factory set to open at appro.. 40 bar
(580 p.s.i.) which is adequate for most conditions.
If the damping seems too “soft” or too “hard”, the set-
tings can be adjusted on the screws shown.
Shoc Shoc Shoc Shoc Shock a k a k a k a k absorber bsorber bsorber bsorber bsorbersssss
If the shock absorbers loose their efficiency or start
leaking oil, they should be replaced.
Le Le
Le Le
Levvvvvel indica el indica
el indica el indica
el indicator adjustment tor adjustment
tor adjustment tor adjustment
tor adjustment
The level indicator reading should be checked regularly.
When the tank is empty,
the float should lie on the
stop pin, of the rod, and
the O-ring on the indicator
should be positioned at
the top position line A .
If any deviation is found,
pull out the plug B , loosen
screws C , and adjust the
length of the cord.
Cor Cor Cor Cor Cord r d r d r d r d rene ene ene ene enew w w w wal, le al, le al, le al, le al, levvvvvel indica el indica el indica el indica el indicator tor tor tor tor
If the cord on the level indicator has to be changed, the
float guide pole is removed:
1. Remove the tank drain valve (see paragraph “Main
tank drain valve”) and loosen the fitting holding the
pole in position.
2. Pull the pole down through the drain valve hole till it is
free in the top of the tank.
3. The pole can now be taken out of the tank through
the filling hole.
DANGER! Do not attempt to enter the tank - the
float pole can be removed from outside the tank!
Seal r Seal r
Seal r Seal r Seal rene
ene
ene ene enew
w
w w wal, dr
al, dr
al, dr al, dr al, drain v
ain v
ain v ain v ain valv
alv
alv alv alveeeee
If the main tank drain valve leaks, the seal and seat can
be changed the following way.
DANGER! Do not enter the inside of the tank -
the parts can be changed from underneath the
tank!
WARNING! Use eye / face protection mask when
dismantling the tank drain valve!
1. Make sure the tank is empty and clean.
2. The valve must be closed and the string loose.
T191-0018
A
B
C
illustration