ASTM D6973 Standard Test Method for Indicating Wear Characteristics of Petroleum Hydraulic Fluids in a High Pressure Constant Volume Vane Pump
8. Test Stand Maintenance
8.1 Temperature, pressure, flow sensors and shut-off switches shall be checked periodically for proper calibration and operation in accordance with good engineering practice, as determined by the user.
NOTE 4 - If an axial turbine flowmeter is used, calibrate with 0.876 specific gravity, ISO Grade 32 hydraulic oil. Perform a 10-point calibration over a ranges of 0 L/min to 227 L/min (0 gpm to 50 gpm). This calibration shall be performed by the flowmeter manufacturer or other qualified personnel.
8.2 It is recommended that the pump shaft (P\N 242287), shaft seal (P\N 394973), and shaft bearings (P\N 38441 or equivalent) (see Fig. 2) be replaced after every ten test runs (or sooner if high mass loss, vibration, cavitation, or visual deterioration is encountered).
8.3 Inspect the pump cover and body for evidence of galling marks or excessive wear and replace if distress is observed. Visually examine the interior of the pump cover and outlet body. Replace if evidence of deterioration is observed.
8.4 Check the surface inside the pump outlet body, where the shaft seal is positioned, for conditions that may cause the seal to leak.
8.5 Check alignment of the pump and motor shafts. Maximum values of 0.08 mm (0.003 in.) parallel misalignment and 0.3° angular misalignment are suggested limits.
8.6 Alignment checks shall be made with a torqued cartridge in place.
8.7 Using a dial indicator to check run out, inspect the shaft for a bent condition by rotating it by hand with the motor coupling removed.
8.8 Periodically clean the four tapped holes, which receive the pump head bolts and the threads of the head bolts themselves. The threads may be coated with a light oil to prevent corrosion. To ensure even torquing of the cartridge, housings, or head bolts with damaged threads shall be discarded.
8.9 Periodic disassembly ofthe reliefvalve for cleaning and inspection is recommended.
9. Sampling
9.1 The sample offluid shall be thoroughly representative of the material in question, and the portion used for the test shall be thoroughly representative of the sample itself.
10. Flushing
10.1 Proper cleaning and flushing of the entire system is extremely important in order to prevent cross-contamination of test fluids.
10.2 Flushing Procedure for Petroleum and Synthetic Fluids:
NOTE 5 - This flushing sequence is not adequate when changing fluid types, such as from glycol to phosphate ester, oil to glycol, and so forth. It is the responsibility of the user to determine the suitability of alternative solvents and any hazards associated with their use. Please reference ANSI/(NFPA) document No. T2.13.1 or ISO 7745, or both, for additional instructions.
10.2.1 Drain all old fluid from the system, remove used test cartridge (if not already done), and remove and discard old filter.
10.2.2 Before setting up and installing the test pump, the system must be clean from debris and leftover fluid. Install a new filter, flush cartridge (any new or used pump cartridge) with 190 L +/- 4 L (50 gal +/- 1 gal) of the test fluid (ISO VG 32).
10.2.3 Allow the system to flush for a minimum of 30 min at the following conditions: motor speed = 2400 r/min +/- 50 r/min, outlet pressure = 3.5 MPa +/- 0.2 MPa (500 psi +/- 20 psi).
10.2.4 After the stand flush is complete, drain the entire system, remove the filter, and remove the flush cartridge.
10.2.5 If in the opinion of the lab personnel the stand needs additional flushing, repeat 10.2.1-10.2.4.
10.2.6 Install a new filter and charge the system with 190 L +/- 4 L (50 gal +/- 1 gal) of new test fluid. Before starting a test, the fluid cleanliness level shall be less than or equal to ISO cleanliness code 18/16/13 (see ISO 4406). Particle counting shall be in accordance with ISO 11500, or use an automatic particle counter calibrated in accordance with ISO 11171. Fluid cleaning consists of using a filter cart to clean the fluid before installing it into the stand. A flush cartridge can also be used to circulate the fluid in the stand until the required ISO cleanliness code is met. If a circulating cart is used, be sure to flush with next test fluid and change out filter to ensure no cross contamination.
11. Preparation and Installation of Test Cartridge
11.1 Disassemble the 35VQ25A-11*20, Fig. 1, and identify the vanes, cam ring, and side plates, Fig. 2, for reassembly into the same location.
11.2 Using a solvent, thoroughly clean the cam ring and set of ten vanes. Allow the cam ring and vanes to dry. Determine the mass (separately) of the cam ring and the complete set of ten vanes (without intra-vanes or inserts). Determine these masses to the nearest milligram and record the values. The vanes shall be demagnetized before their mass is determined. Demagnetize with a degausser as needed.
11.3 Assemble the test cartridge according to Eaton Overhaul Manual I-3144-S. Make certain of proper vane insertion into the rotor and correct rotor and inner and outer bushing direction and alignment. The vanes shall be checked for free movement in rotor slots when assembling.
