Echo 74554 Owners Manual v.3 - Manual (Page 18)

14 5 INCH CHIpper
SERVICE AND MAINTENANCE
System pressure is controlled by the hydraulic control
valve, which is set at 2500 PSI.
In the unlikely event the the oil is completely drained
from the hydraulic system, oil must be added and any air
bubbles must be purged from the system. To do this:
1. Make sure all system components (reservoir, fittings,
etc.) are clean before starting the hydrostatic pump.
2. Fill the reservoir with recommended hydraulic fluid.
Filter fluid before filling the reservoir.
3. Fill the inlet line leading from the reservoir to the hy-
draulic pump before start-up. Loosen the fitting on the
pump inlet line until oil bleeds out.
4. Start the engine and run at the lowest possible
RPM.
5. The oil level in the reservoir drops and bubbles may
appear in the fluid as air is purged from the unit. Refill
the reservoir as necessary.
6. Run the unit and move the control arm in both direc-
tions for several minutes until any remaining air is
purged from the unit. Refill the reservoir as neces-
sary.
7. Check to ensure the feed roller stops when the control
arm is in the neutral position.
8. Shut down the engine or disengage PTO, check for
and correct any fluid leaks, and check the reservoir
level. Add fluid if necessary.
Check the reservoir daily for proper fluid level, the
presence of water (noted by a cloudy to milky appearance,
or free water in bottom of reservoir), and rancid fluid odor
(excessive heat). The hydraulic pump normally does not
require regular fluid changes.
Premium hydraulic fluids containing high quality rust,
oxidation, and foam inhibitors are required. These include
premium turbine oils, API Cd engine oils per SAE J183,
M2C33F or g automatic transmission fluids meeting
Allison C-3 or Caterpillar TO-2. and certain specialty
agricultural tractor fluids.
The hydraulic oil filter should be changed after the first
50 hours and every 200 hours thereafter or at annual
intervals. The fluid and filter should be changed and
system cleaned if the fluid becomes contaminated with
foreign matter (water, dirt, grease, etc.) or if the fluid has
been subjected to temperature levels greater than the
maximum recommended.
The filter is located underneath the hydraulic reservoir.
To change the hydraulic oil filter:
Using an oil filter wrench, unscrew the filter. 1.
Once the filter becomes loose, turn it out the rest of 2.
the way with your hand.
Properly discard old filter.
3.
Lube the rubber seal on the new filter (PN 16588) with 4.
clean hydraulic oil.
Install the filter onto the threaded pipe. Turn with your
5.
hand until the filter is finger tight.
Turn, by hand, another 1/2 turn.
6.
Check hydraulic oil level and fill if necessary. 7.
CauTion
Handle pressurized hydraulic fluid carefully. Escaping
pressurized hydraulic fluid can have sufficient force to
penetrate your skin causing serious injury. This fluid
may also be hot enough to burn. Serious infection or
reactions can develop if proper medical treatment is
not administered immediately.
5.10 filling HYdrauliC fluid
hydraulic systems contain fluid under high pressure.
Never check for leaks with your hands. Relieve
pressure before disconnecting any hydraulic lines.
CauTion
5.11 CHanging HYdrauliC oil filTer
HYDRAULIC
FILTER