G I S C H A I N H O I S T S W I S S Q U A L I T Y
16
3.2 Service and maintenance
3.2.1 Maintenance overview
During service and maintenance work, general accident prevention directions, special
safety directions (chapter 0.3) as well as hazard protection instructions (chapter 0.4)
should be followed.
DANGER !
Service and maintenance work should only be performed on unloaded
electric chain hoists. The main switch must be off. The lower sheave or
hook fittings must be lying on the floor or a maintenance platform.
Maintenance work encompasses visual checks and cleaning routines. Service work
includes additional functional checks. During the functional checks, all securing
elements and cable clamps must be checked for secure seating.
Cables must be inspected for dirt, discoloration and arc spots.
CAUTION !
Used operating materials (oil, lubricants, etc.) should be safely collected
and disposed of in an environmentally friendly manner.
Service and maintenance intervals are defined as follows:
t ............ : daily
3 M ....... : quarterly
12 M ..... : annually
The predefined service and maintenance intervals should be reduced when the loading
of the electric chain hoist is exceptionally large and when frequently operated in adverse
conditions (dust, heat, humidity, steam, etc.).
See table 3-1.
Table 3-1 Maintenance overview
Term
t
3 M
12 M
Activity
Notes
1. Load chain
X
visual check
clean and lubricate as needed
see chapter 2.2.2
2. Hoist and carriage
X
abnormal noise check
seal check
3. Power supply cable
X
visual check
4. Limit switch
X
function check
see chapter 2.2.3
5.
Seal
X
visual
check
6. Cable discharging device control cable
X
visual check
3.2.2 Service overview
See table 3-2.
Table 3-2 Service overview
Term
t
3 M
12 M
Activity
Notes
1. Load chain
X
X
lubricate
measure wear
see chapter 2.2.2 / 3.2.4
2. Brake system
X
X
function check with load
see chapter 3.2.3
3. Electrical fittings
X
function check
4. Securing screws on suspended parts
and load hook with accessories
X
check for cracks
check screw movement
see chapter 3.2.8
5. Gearing
X
visual check wear
see chapter 3.2.6
6. Limit switch
X
check switching elements
see chapter 2.2.3
7. Slip clutch
X
function check
see chapter 3.2.7
3.2.3 Brake system
The spring-loaded brake is a solenoid operated single disk brake with two friction
surfaces. The braking force is applied by compression springs. The braking torque is
generated when no current is applied. The ventilation is electromagnetic. The brake
operates with DC current.
The brake must be able to hold the nominal load in power free mode without any
problems.
CAUTION !
The brake coil voltage must be the same as the operating voltage.