Basic service
27
Basic service
Before servicing the Hydra, read and observe all the precautions listed in “Safety information” on
page 3. Any service not described in this section must be carried out by a Jem service technician.
Excessive dust, smoke fluid, and dirt buildup will degrade performance and cause overheating and damage
to the machine that is not covered by the product warranty. To maintain adequate cooling, dust must be
cleaned from the outer casing and air vents of the base and heads periodically.
Isolate the heads from power and allow to cool completely before cleaning. The smoke output
nozzle remains hot for up to 10 hours after use.
• Remove dust from the air vents with a soft brush, cotton swab, vacuum, or compressed air.
• Clean the outer casing with a damp cloth only.
When the heads have been idle for 13 seconds, the system goes into a repeating leak detection cycle. The
pressure at the beginning of the cycle is compared to the pressure at the end; if the pressure falls by more
than 2 psi, a leak is assumed and the system shuts down automatically.
OFF
appears in the left display, the
heads stop firing, the output valves close, and the fluid pump stops running.
Resolve the problem as follows.
1. Inspect the fluid line for signs of leaking fluid.
2. If a leak is found, drain the fluid line as described below. Turn off the base and repair the fluid line, making
sure the tube ends are clean and square. Restart the system and prime the base and fluid line.
3. If no leak can be found, the value of the pressure test time setting may be too high. Lower the setting as
described under “
(pressure test time) setting” on page 19. Prime the base and resume operation.
4. If the problem persists, it is likely that air trapped in the line is causing the pressure to fall. Check for blind
runs in the fluid line and eliminate any that you find. Prime the base, then prime the fluid line thoroughly
by firing all heads until there are no interruptions in the output.
The fluid line can be drained to remove the fluid when servicing the line or heads, or changing fluid types.
Fluid lines equipped for touring with self-seal connectors need not be drained for transport.
Make sure there is sufficient room in the tank when draining: a typical fluid line contains 5 to 10 liters of fluid.
Drain the fluid line as follows.
1. Under the left display, press menu as required to display
tnc
.
2. Select the tank in which to drain the fluid using the up or down keys.
3. Press menu as required to display
FLU
.
4. Use the up or down keys to select
dra
.
5. Press enter. This opens the drain valve on the selected tank and disables the pump.
6. If the heads are installed above the base, fluid will drain into the tank but it will be necessary to allow air
into the system by removing a plug or 6 mm adaptor at the end of the fluid line, or at the high point if the
line is connected in a ring.
If there is little rise in the system, it may be necessary to push the fluid back to the tank using a supply of
compressed air (maximum 3 bar) at the end of the fluid line.
If the end of the fluid line is lower than the base, the fluid will flow towards the end of the line instead of
the tank. Use an empty tank to collect fluid here.
7. After the line has drained, be sure to close the fluid line before priming the system again.
C l e a n i n g
D i a g n o s i n g l e a k s
D r a i n i n g t h e f l u i d l i n e