Sheet 4 of 7
Preventive Maintenance continued
B. Hydraulic Fittings
1. Inspect for leaks.
●
Tighten fittings to stop leak.
●
Replace fittings if tightening does not stop leak.
C. Hose
1. Inspect and replace if found to contain cuts, cracks, or considerable surface wear.
D. Pump
1. Check hydraulic fluid level.
●
The fluid level should be
( mm??)
from the filler/vent cap with cylinder retracted. Replenish
with hydraulic fluid (P/N 9637) through this port if needed.
2. Check pump reservoir for leaks due to damage to reservoir.
3. Raise and lower platform by operating air pump pedal. Ensure platform raises and lowers only when
the air pump pedal is actuated.
WARNING: To prevent personal injury and/or equipment damage, discontinue use and
service the unit immediately if platform moves after air pump pedal is released.
4. If platform moves slowly when raising, or pump seems to reciprocate faster than normal, install an
automatic air line oiler prior to the pump.
●
When automatic air line oiler is installed, some oil discharge from pump exhaust is normal and
indicates proper lubrication.
E. Lubrication
1. Use a grease gun to thoroughly apply grease at every location fitted with grease fitting (i.e., upper
& lower rollers, casters, scissor & hydraulic cylinder pivot pins, etc.). Pump grease into fitting until
only new grease can be seen escaping from joint. Wipe away excess.
F. Cleaning
1. Wipe dirt, debris, and grime from all surfaces using clean rag.
Every 3000 cycles or 24 months, whichever comes first:
A. Draining and Flushing the Pump Reservoir
1. Remove screws that fasten pump assembly to reservoir. Remove pump assembly from reservoir.
Do not damage gasket, filter or safety valve.
2. Drain reservoir of all fluid and refill half full with clean hydraulic fluid
( mod?).
Rinse filter clean.
3. Place pump assembly back onto reservoir, and secure with two machine screws assembled in
opposite corners of housing.
4. Run unit for several minutes. Use same method described in section titled “Priming the Pump Unit.”
5. Drain and clean reservoir once more.
6. Refill reservoir with hydraulic fluid (
mod?)
and replace pump assembly (with gasket) on reservoir
and install screws. Torque screws to 25 to 30 inch pounds (2.8 to 3.4 N•m).
B. Refilling the Pump Reservoir
1. If additional fluid must be added to reservoir, use only hydraulic fluid (p/n 9637; 215 SSU @ 100°
F [38° C]). Clean entire area around filler plug before adding fluid to reservoir. Remove filler plug,
and insert a clean funnel with filter. The cylinder must be fully retracted and air supply disconnected
when adding fluid to reservoir.
