Summary of Contents for U.S. Divers Impulse
- Page 1 Impulse Second Stage Regulator Authorized ™ Aqua-Lung Dealer SERVICE & REPAIR MANUAL ● ● ● P.O. Box 25018 3323 W. Warner Ave. Santa Ana, CA 92799-5018 Copyright ©1997 U.S. Divers Co., Inc. Doc. No. 1078-56...
-
Page 2: Table Of Contents
Table of Contents Introduction ....................1 Warnings, Cautions, & Notes ................... 1 Scheduled Service ......................1 General Guidelines ......................1 Initial Inspection Procedure ................2 External Inspection ......................2 Pressure Test ........................2 Disassembly Procedures ................3 Reassembly Procedures................6 Final Adjustment &... -
Page 3: Introduction
Doc. #1078-56 Service & Repair Manual - Impulse Second Stage Introduction GENERAL GUIDELINES In order to correctly perform the procedures This manual provides factory prescribed proce- outlined in this manual, it is important to follow dures for the correct service and repair of the Im- each step exactly in the order given. -
Page 4: Initial Inspection Procedure
Impulse Second Stage Service & Repair Manual Initial Inspection Procedure EXTERNAL INSPECTION Visually inspect the first stage filter to check for any signs that contaminants, such as moisture, rust, aluminum oxide, or charcoal may have entered the IP hose and second stage. -
Page 5: Disassembly Procedures
Impulse Second Stage Service & Repair Manual Disassembly Procedures NOTE: Before performing any disassembly, refer to the schematic drawing, which references all mandatory replace- ment parts. These parts should be replaced with new, and must not be reused under any circumstances - regardless of the age of the regulator or how much use it has received since it was last serviced. - Page 6 Impulse Second Stage Service & Repair Manual pletely depressed with one hand, firmly grasp the adjustment knob and pull straight out to remove the entire valve module assembly from the box bottom (see Fig. 2). CAUTION: Do not attempt to remove the valve module assembly from the box bottom without first holding the lever depressed.
- Page 7 29. Remove the exhaust valve diaphragm(9) from the box bottom and discard. This concludes the disassembly of the Impulse second stage. Refer directly to Procedure A and Table A, titled Cleaning & Lubrication, before proceeding to the Reas- sembly Procedures.
-
Page 8: Reassembly Procedures
WARNING: Use only genuine U.S. Divers parts, subassem- blies, and components whenever assembling U.S. Divers products. DO NOT attempt to substitute a U.S. Divers part with another manufacturer’s, regardless of any similarity in shape, size, or appearance. Doing so may render the product unsafe, and could result in serious injury or death. - Page 9 Impulse Second Stage Service & Repair Manual CAUTION: Do not use a tool to install the exhaust tee. Doing so may cause serious damage to the seating flange, requiring replacement of the box bottom. Fig. 12 - Crown Installation Lay the valve body(23) lengthwise with the positioning mark facing up as shown in Figure 11.
- Page 10 Impulse Second Stage Service & Repair Manual breakage. If damage is found, discard the poppet and replace with new before repeating steps 11-12. 14. Install the O-ring(22b) into the groove of the valve body that is adjacent to the hexagonal feature.
- Page 11 Impulse Second Stage Service & Repair Manual 21. Turn the valve module as needed to align the hex feature with the hexagonal opening of the box bottom so that the lever stands straight up inside. Press the valve module completely into the box bottom, until the adjustment knob is flush against the outer side.
-
Page 12: Final Adjustment & Testing Procedures
Fig. 16a - Boxtop Installation - Step 2 NOTE: Before performing the following procedure, refer to Table 5, titled Test Bench Specifications - Impulse 2nd Stage CAUTION: Prior to adjusting and testing the Impulse sec- ond stage regulator, the accompanying first stage must be correctly serviced, adjusted to a stable intermediate pressure of 140 psi , and fully tested. - Page 13 Impulse Second Stage Service & Repair Manual and gently turn the knob until it can be felt that the adjustment stem has mated into the slotted head of the crown. Continue to hold the knob inward, in order to prevent it from being pressed outward by the internal air pressure.
-
Page 14: Second Stage Air Flow Test
Impulse Second Stage Service & Repair Manual NOTE: If an accurately calibrated airflow test bench is not available, proceed to Subjective Tuning Procedures provided on the following page. SECOND STAGE AIR FLOW TEST With the regulator still connected to the test bench, pressurize the system to 3000 psi (±100) and place the second-stage... -
Page 15: Subjective Breathing Test
When exhaling, there should be no fluttering or sticking of the exhalation valve. If any of these problems occur, refer to Table 1 - Troubleshooting. This concludes annual service procedures for the Impulse © 1997 U.S. Divers Co., Inc. -
Page 16: Table 1 - Troubleshooting Guide
Impulse Second Stage Service & Repair Manual Table 1 Troubleshooting Guide Impulse Second-Stage SYMPTOM POSSIBLE CAUSE TREATMENT Leakage or freeflow from 1. High first-stage intermediate pressure. 1. Refer to first-stage Troubleshoot- second stage (should be 140 ±5 psi) ing Guide. - Page 17 Impulse Second Stage Service & Repair Manual Table 2 Recommended Tool List PART NO. DESCRIPTION APPLICATION 7803-00 Aqua-Lung Service Manual All Aqua-Lung regulators 1116-00 I.P. test gauge Intermediate pressure testing 0-120 inch-lbs torque wrench Small fittings 9440-22 O-ring tools O-ring removal & installation...
-
Page 18: Table 4 - Torque Specifications
Impulse Second Stage Service & Repair Manual Table 4 Torque Specifications PART NUMBER DESCRIPTION / KEY NUMBER TORQUE 1005-35 LP Hose Female Fitting / 8 40 (±3) inch-lbs 1078-03 Hex Nut / 11 50 (±5) inch-lbs Table 5 Test Bench Specifications... -
Page 19: Procedure A - Cleaning & Lubrication
Procedure A Cleaning & Lubrication (All Aqua-Lung Regulators) ™ 1. Acid Bath - U.S. Divers strongly recommends ChromeSafe regulator cleaner (P/N 0201-09) for clean- ™ ing all reusable brass and stainless steel parts. ChromeSafe is a specially formulated cleaner that does not harm rubber or Teflon parts, yet effectively removes silicone grease, corrosion, and grime from metal parts, leaving only a brilliant shine. - Page 20 Impulse Second Stage Service & Repair Manual Table A Recommended Lubricants & Cleaners (All Aqua-Lung Regulators) LUBRICANT / CLEANER APPLICATION SOURCE Dow Corning ® All O-rings; threaded metal parts Dow Corning Corp. (pure silicone grease) P.O. Box 1767-T Midland, MI 48640 800-248-2481 CAUTION: Silicone rubber requires no lubrication or preservative treatment.
- Page 21 Impulse Second Stage Service & Repair Manual TECHNICIAN'S NOTES © 1997 U.S. Divers Co., Inc.
- Page 22 Impulse Second Stage Service & Repair Manual Second-Stage Regulators Impulse Key # Part # Description Key # Part # Description ----- 1078-15 Impulse Second Stage w/out hose 18 ---- 8601-37 C-clip 19 ---- 1078-22 Exhaust Valve 1 ----- 1078-23 Box Top...
Need help?
Do you have a question about the Impulse and is the answer not in the manual?
Questions and answers