07 - 52 RT60 Rough Terrain Crane
f) AIR BRAKES At least once a day, drain the water accumulation from the air tanks;
g) Special attention must be given to the hydraulic oil during very cold weather;
NEVER ENGAGE THE HYDRAULIC PUMP AND ACTUATE THE HYDRAULIC
SYSTEM BEFORE THE HYDRAULIC OIL IS WARM. Cold, sluggish oil can cause
pump cavitation. If the crane is not equipped with a reservoir immersion heater
and running the oil over relief will not warm it sufficiently to prevent pump
cavitation with the engine running very slowly, cease attempts to engage the
main pump until an external heat source can be obtained.
Once the reservoir is warm to the touch, actuate the hydraulic system by engaging the
hydraulic pump. Continue warming the oil and slowly cycle all crane functions,
actuating all cylinders in turn, swing the upperstructure and operating the winches in
both directions.
The hydraulic oil may be run over relief to aid in the warm-up process. To do this,
actuate a function, allow the cylinders involved to reach the limits of their travel and
hold the control in the engaged position for a few seconds. When running hydraulic oil
over relief to warm it, be sure to restrict the flow to as slow a speed as possible by
moderating pressure on the controls being engaged and running the engine at low
speed.
h) At the end of the work period, or whenever the crane is to be left idle for extended
periods, prevent it from being frozen to the ground by parking it on a wood, concrete,
asphalt or mat surface.
EXTREME HEAT
Like extreme cold, requires that precautions be taken with respect to the cooling system,
the battery and lubrication. Protect the crane by performing the following recommended
procedures:
a) High temperatures necessitate the use of lubricants which are both more viscous and
which resist deterioration at higher operating temperatures. Refer to the Operator’s
Manual and lubricate the crane using the lubricants recommended for the expected
temperatures. Crankcase oil is particularly important because it helps dissipate heat.
Check the oil level frequently and add oil as necessary to maintain required level. Too
little oil will hinder heat dissipation;
b) To ensure proper coolant circulation, drain and flush the cooling system, clean any
foreign matter from the radiator cooling fins and through core air passages, replace
defective hoses, tighten hose clamps, tension the water pump drive belt properly,
eliminate any leaks detected and fill the system with a 50% solution of ethylene glycol.
A corrosion inhibitor is recommended.
Engine overheating due to loss of coolant will most often be corrected by SLOWLY
adding coolant while the engine is running at FAST IDLE. Should this fail to correct the
problem, drain and flush the system and refill with fresh coolant (50% solution of
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