Echo 74520 Owners Manual v.2 - Manual (Page 18)

Page 14 5" Chipper W/Hyd Feed Owners Manual
Hydrostatic pressure controlled by the hydraulic control valve,
set at 2500 PSI.
Follow this start-up procedure to start a new installation or
to restart an installation if the hydrostatic pump was removed
from the system.
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.
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.
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.
Operation
4.4 HYDRAULIC FEED INSTRUC-
TIONS
4.4.1 FLUIDS
4.4.2 HYDROSTATIC START UP PRO-
CEDURE
3. Fill the inlet line leading from the reservoir to the
hydraulic 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
directions 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.
NOTE
A fitting may need to be loosened and oil-bled to re-
move air from the system (use same procedures as
steps 3-5).