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 11.3 PUMP EQUIPMENT
11.3.1 Main Line Switch
The inspector should closely examine the condition of the main line switch before inspecting
any moving part because opening the switch may not have removed all power from a particular
lift. This condition is very prevalent when lifts share the same pump unit.
11.3.2 Pumps
Pumps should be checked for leakage around the shaft, and for unusual noise which could be
caused by cavitation due to a partially plugged suction line or strainer.
11.3.3 Drives (If Applicable)
Belt drives should be checked for wear, initial tension, and reasonable equality of tension
among members or a set. Chain drives should be checked for wear, both on the chain and
sprockets. Direct-drive couplings, where accessible, should be checked for excessive play.
11.3.4 Relief And Check Valves
Determine whether relief and check valves are provided and properly located. Examine relief
valves, where provided, and note their condition and whether there is leakage. Relief valves
should have a lead block and wire type seal on the means of adjustment and should be intact.
Determine whether the check valve operates to stop and hold the lift when the pump stops.
11.3.5 Flexible Hydraulic Hose And Fitting Assemblies
Examine under working pressure, flexible hydraulic hose and fitting assemblies and flexible
couplings installed between the check valve or control valve and the cylinder. Evidence of
leakage, slippage or hose fittings, and damage to outer hose covering sufficient to expose
reinforcement or distortion or bulging of hose body are cause for replacement of the hose and
fitting assembly or the sealing element of a flexible coupling. Check hose and fitting assemblies
for proper identification and replacement date.
11-6
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