Gradall 534D-6T Service Manual - Manual (Page 257)

F ORM N O. 29813 • I MPLEMENT C IRCUIT P ERFORMANCE C HECKS (C & D Series Material Handlers)
H YDRAULIC S YSTEM P RECAUTIONS
Always relieve trapped pressure
before opening or disconnecting
any portion of a hydraulic circuit.
Oil at operating temperature can
cause serious burns. Oil released
under pressure can cause
serious injury or death.
NOTE!
You do not have to relieve
trapped pressure in order to
install the mini-check/hose/gauge
combination. Always make sure
the gauge and adapter are
securely tightened on the hose.
Also make sure the seating
surfaces and threads of the
mini-check and adapter are
clean and undamaged.
WARNING !
• Make sure the hydraulic fluid level in the reservoir is maintained at the
proper level. If the fluid level drops unduly, the pumps will be starved and
will be destroyed almost immediately.
• Hydraulic fluid must be completely free of contamination at all times.
Contaminated hydraulic fluid can severely damage hydraulic components. It
may even destroy the entire hydraulic system. Contaminants include dust,
sand, water, and minute particles of packing or metal from worn/damaged
system components. CHECK THE HYDRAULIC FLUID INDICATOR DAILY, with
the fluid at the correct operating temperature. Replace filters as soon as the
Indicator warns you. Always clean the reservoir cap and the surrounding
area thoroughly before removing the cap. Any fluid you add to the system
must conform with the specification outlined in the “Recommended Lubricants
and Capacities” Chart posted on the machine and in the relevant Owner/
Operator Manual. Add only clean fluid using a clean funnel or hose.
• If you have a reason to suspect hydraulic fluid contamination, send a sample
for analysis IMMEDIATELY! If the system is contaminated, all related
components must be drained, flushed and cleaned before the system is
refilled.
• Watch for leaks or seepage of hydraulic fluid, especially between the reser-
voir and the pump. Any leakage point may draw air into the system and
trapped air can do just as much damage to a hydraulic system as sand!
• Use a piece of cardboard or paper to search for leaks. DO NOT use your bare
hands! When tightening hydraulic hoses, always use two wrenches: one to
tighten the hose, the other to hold the hose and prevent it from twisting. All
hydraulic hoses must lie and roll free of stress.
• If you have to open or disconnect a hydraulic circuit, be very careful!
R EQUIRED T OOLS F OR T ESTING/ A DJUSTING
• Hydraulic Pressure Testing Gauge Kit (7,500 PSI/10,000 PSI Gauge and
1,000 PSI Gauge)
• SAE Combination Wrench Set (up to 1¼”)
• Metric Combination Wrench Set (up to 19 mm)
• SAE Allen Key Set
• Metric Allen Key Set
• Large Blue Plastic Caps (Gradall P/N 8093-4460)
• Small Blue Plastic Caps (Gradall P/N 8093-4459)