Motor Cooling Fan Inspection And Cleaning; Seal Inspection; Hoses Check; Cyclone Filter Protector Cleaning And Replacement (Optional) - Nilfisk cfm VHT437EXP Manual De Instrucciones

Motor cooling fan inspection and cleaning

WARNING!
These operations can only be carried out by trained
and qualified personnel.
Periodically clean the motor cooling fan to prevent the motor
from overheating, especially if the vacuum cleaner is used in
a dusty place (1, Fig. 5).

Seal inspection

Hoses check

Make sure that the connecting hoses are in good condition
and correctly fixed.
If the hoses are damaged, broken or badly connected to the
unions, they must be replaced.
When sticky materials are collected, check for possible
clogging along the hose (3, Fig. 15), in the inlet and on the
deflector inside the filtering chamber.
Scrape the inlet (3, Fig. 15) from the outside and remove the
deposited waste as indicated in Figure 15.
Filter chamber seal check
If the gasket (1, Fig. 16) between the container and the filter
chamber (3) fails to guarantee tightness:
■ Loosen the four screws (2) that lock the filtering chamber
(3) against the vacuum cleaner structure.
■ Allow the filtering chamber (3) to lower down and tighten the
screws (2) once it has reached the tightness position.
If an optimal seal cannot be obtained and the gasket (1) is
torn or cracked, etc. it must be replaced.
Cyclone filter protector cleaning and
replacement (optional)
[ NOTE ]
If there is a dust deposit on the separator (3, Fig. 17) allow
the dust to drop through the central hole.
The cyclone filter protector (3, Fig. 17) should first be
disassembled in order to be perfectly cleaned:
■ Use the band latch (1) to remove the lid (2) together with
the primary star filter.
■ Unscrew the two screws (4) and remove it from the
container.
Replace the part if it is excessively worn.
Assemble the components in the reverse order of
disassembly.
02/2014

Wiring diagrams

VHT437EXP (Fig. 18)
Item Type Description
4083901574
+ Undervoltage release 460V 60Hz
4083901573
4083901574
B1 + Undervoltage release 220V 60Hz
4083901578
4083901574
+ Undervoltage release 575V 60Hz
4083901579
4-6.3A circuit breaker (460V 60Hz,
8-39679
575V 60Hz)
Q1
8-39681 10-16A circuit breaker (220V 60Hz)
VHT456EXP (Fig. 18)
Item Type Description
4083901574
+ Undervoltage release 460V 60Hz
4083901573
B1
4083901574
+ Undervoltage release 575V 60Hz
4083901579
6.3-10A circuit breaker (460V 60Hz,
Q1 8-39680
575V 60Hz)
11
VHT437EXP - VHT456EXP
Qty.
1
1
1
1
1
Qty.
1
1
1
C404
US