Fluke RUSKA 2470 User Manual

6-2 

Being forewarned of the hazards, the technician should wipe the bench and all instrument 

surfaces in the vicinity of the Piston Pressure Gauge before starting disassembly 

operations. A wad of Kim-Wipes slightly wetted with a solvent, such as high grade 

alcohol or acetone will help pick up particles that invariably accumulate near the gauge.  
A clean space should be prepared on a work bench. Cover this space with paper towels so 

that cleaned parts will not be contaminated.  
REMOVE ALL PRESSURE FROM THE PISTON PRESSURE GAUGE BY VENTING 

THE PRESSURE HOUSING TO THE ATMOSPHERE.  
Unscrew the knurled retaining cap from the top of the housing and lay it aside on a clean 

Kim-Wipe. 

The piston/cylinder assembly should be tested for cleanliness and proper operation before 

and after each use. Perform the following steps to test for proper operation and to show 

that the assembly is clean. 
1.  Install the piston/cylinder assembly into the DWG base and secure the retaining cap. 
2.  Pressure the base until the piston alone is floating near mid-stroke. 
3.  With a gentle stroke of the finger, rotate the piston while also causing it to bounce in 

the cylinder. After a few strokes allow the piston to coast on its own. Although the 

rotation of the mid and high ranges may be lengthy, the free rotation of the low range 

may last only a brief few seconds. At any rate, all ranges should rotate freely with no 

sudden changes in rotation speed and should coast to a gradual stop. The last bit of 

rotation just before stopping is often the most useful in judging if the piston is 

functioning correctly. 

4.  If the piston does not perform as indicated above, it should be cleaned and retested. If 

the subsequent cleaning does not improve the results, the assembly may be damaged 

and should not be used until a qualified inspection is made as to the source of the 

failure. 

Cleaning supplies (refer to Figure 6-1) consist of: 

•

  Solvent, such as high grade alcohol or acetone 

•

  Low-lint paper wipers, such as Kimberly Clark, Kimwipes number 34155 

•

  Cleaning tool number 2460-56 

•

  Wooden applicator sticks, such as Puritan number 807-12 

•

  Cashmere Bouquet brand hand soap 

•

  Bottle brush, such as RUSKA part number 7-682 

•

  Size 0 rubber stopper, such as RUSKA part number 81-536 

•

  Warm tap water  

1.  Prepare a clean work area near a running tap water source.  
2.  Prepare several sets of folded wipers as shown in Figures 6-2 through 6-4. Two 

wipers can be folded together for wiping the outside of the piston and cylinder. A 

single folded wiper can be inserted into, then wrapped around the cleaning tool for 

cleaning the bore of the cylinder.  

3.  Disassemble the piston/cylinder assembly.  
4.  Pre-clean the piston and cylinder using solvent soaked wipers.