Gravely 950001, Maintenance Manual

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IMPORTANT: Do not substitute automotive oil.
Hydraulic system damage may result.
2. Place a drain pan under the drain plug that will hold
at least 17 gallons (67 l).
3. Remove the drain plug. Allow the fluid to
completely drain out.
4. Reinstall the drain plug.
5. Fill the hydraulic tank with approximately 15 gal.
(57 l) of ISO 68 or equivalent (refer to Check
Hydraulic Fluid).
NOTE: Dispose of used oil at a certified recycling
center.
4.20 CHANGE HYDRAULIC FILTERS
The hydraulic system is protected by two filters, a high
pressure filter immediately down stream of the gear
pump and a spin-on return line filter mounted on a
stand-pipe at the right hand side of the reservoir
(opposite the dip-stick fill point). Both filters are fitted
with 10 micron elements.
Change the hydraulic filters after the first 8 operating
hours and again after every 100 operating hours.
Spin-on Filter
1. Position unit on a level surface, lower the lift arms,
stop the engine, and remove key from ignition
switch.
IMPORTANT: Do not substitute automotive oil.
Hydraulic system damage may result.
2. Place drain pan under filter.
3. Turn old filter counterclockwise to remove.
4. Wipe unit mating surface clean.
5. Lubricate the rubber gasket on the new filter with a
thin coat of hydraulic fluid.
6. Turn the new filter clockwise until it makes contact
with the sealing surface. Tighten filter another 1/2
turn.
High Pressure Filter
1. Start engine and raise lift arms.
2. Stop engine and remove key.
3. Lower cylinder lock into position over the top of
cylinder body.
4. Use a 13 mm wrench and remove capscrews that
fasten the flat plate over wheel motors.
5. Place oil pan below canister.
6. Remove oil canister with a 1” wrench.
7. Replace filter element.
8. Reinstall filter canister and flat panel.
9. Clean up any spilled fluids.
10.To remove air from the system, start the engine
and run for two to three minutes.
11.Observe fluid level and add oil as needed. Do not
fill past “Full” mark on dipstick.
4.21 CHECK HYDRAULIC LINES
Check hydraulic lines after every 100 hours of opera-
tion. Inspect for wear, cracks, loose connections, leaks,
etc. If hydraulic components require service, stop
engine and move all hydraulic controls in both direc-
tions before any disassembly. Repair hoses as needed.
Moving hydraulic hoses should be replaced every two
years or as wear dictates.
Spin-on
Oil Filter
WARNING: HYDRAULIC FLUID UNDER
PRESSURE can penetrate skin and cause
severe burns that can result in death or
serious injury.
ALWAYS keep body and hands away from pin
holes or nozzles which eject hydraulic fluid
under pressure. ALWAYS use paper or card-
board and not hands to search for leaks.
KNOW that all hydraulic fluid connections are
tight and all hydraulic hoses and lines are in
good condition BEFORE applying pressure to
system.
Foreign fluid injected into skin must be surgi-
cally removed within a few hours by a doctor
familiar with this form of injury or gangrene
may result.
High
Pressure
Filter