the strainer has any damage, holes, etc. it should be
replaced.
3. Flush out the bottom of the tank with clean
hydraulic oil. Re-install all cleaned components and
put the top back on the reservoir with a new gasket.
Clean the filter/breather cap.
4. Fill the tank with fresh oil. Follow specifications
found in LUBRICATION chapter of this manual.
IMPORTANT:
Hydraulic fluid and filters should
be replaced any time contamination is present
before the normally scheduled change.
NOTE:
Perform all other service requIrements
up to this point, as well as the following.
CHECK HYDRAULIC SYSTEM
RELIEF PRESSURES
Pressure settings for relief valves are pre-set at the fac-
tory. A single test port is provided on the dash front of
early units. Later units have two test ports located
under the hood center section access cover. The second
test port is used to check the joystick relief pressure.
Before conducting any test port pressure checks, check
the engine RPM. Engine speed must be 950 to 1000
RPM at idle and 2500 RPM at high idle.
Steering Relief Pressure
Plug a 3000 PSI (207 bar) oil or liquid filled gauge in
the test port. Cramp the steering full to the right or left.
The gauge should read 2000 PSI (138 bar).
Check Main Relief Pressure
With the gauge in the test port and the boom extended,
retract the boom fully. The gauge should read 2800 PSI
(193 bar).
Joystick Relief Pressure on Later Units
Plug a 1000 PSI (69 bar) gauge in the joystick test port.
Start the engine. The gauge should read 425 PSI (30
bar) with the engine at any RPM.
CHANGE HYDRAULIC RESERVOIR
OIL AND STRAINER
Clean all dirt and debris from around the top of the
reservoir, especially around the access cover. Refer to
illustration below and use the following procedure:
1. Remove the drain plug and drain out all used oil.
Wash or blow off all collected particles from the mag-
netic drain plug.
IMPORTANT:
DO NOT discharge oil onto
ground. Catch and dispose of per local waste dis-
posal regulations.
2. Remove the access cover and wash the inlet screen
with clean solvent. Remove the sump filter strainer
from the bottom inside of the reservoir. Wash it also. If
WARNING
Escaping hydraulic oil under pressure can
have sufficient force to penetrate the skin.
Before applying pressure to the hydraulic sys-
tem, be sure all connections are tight and
lines and hoses are not damaged. Use a piece
of wood or cardboard to search for suspected
leaks. If injured by excaping hydraulic oil, see
a doctor familiar with this type of injury at
once or gangrene may result.
Service Every 2000 Hours
Hydraulic Reservoir Sump Strainer Removal
Fill Cap
Dipstick
Access
Cover
TOP OF
RESERVOIR
Gasket
Element
PRINTED IN U.S.A.
53
908424/AP500
Summary of Contents for Dynalift 552
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