Assembly and operation instructions for wormgears series M – F, MF, M, 98, SE, FL and WD.

Worm gears could be shipped with machined bore to the quadrant or with drive bush. Drive bushes are loosely fastened in a place or packed separately. Before every manipulation with drive bush unit remove the drive bush out from the unit. After machining of drive bush replace it when final assembling to the valve is carried out. Position of drive bush in the quadrant is fixed by centering teeth to the centering gap.

Never make assembling without studying these assembling instructions.

This instruction manual is designed to be an aid to the valve maker and the end user. It is not intended to be a fully comprehensive document as it would not be practical to cover all the possible applications.

For selection and utilization Mastergear products is necessary to use informations from valve and actuator producers or from producers of special equipment. Check accompanying documentation and drawings to avoid failures, please.

The manual should be read in conjunction with the valve manufacturer’s data and, where applicable, electric, hydraulic and pneumatic actuator manufacturers’ data. Any data for additional auxiliary equipment, such as limit switches, etc. should also be referred to. Check also whether any drawings or other technical information has been supplied for the actuator.

• The basic unit comprises of a 90°, 180° or 360° worm box. The high ratio reduction ensures back driving from the valve cannot occur and gives low input torque for high output torque. Input drive can be handwheel or electric/hydraulic/pneumatic actuator. Reduction spur boxes can be added to the input face to increase the ratio. This is a standard feature on the larger units. The spur boxes can be single, double, triple or quadruple reduction.
• Auxiliary items are often supplied to customer requirements. Common features are:
• a) Padlock flanges.
• b) Declutch mechanisms.
• c) Friction locks (input and output).
• d) Pedestals mounted on input and output faces.
• e) Electrical/mechanical limit operation.
• f) Chain wheels for remote operation.
• g) 90 degr. mitre boxes.
• h) Extended shafts and bearing arrangements.
• i) Output torque plug.
• j) Output adaptor flanges.
• k) Lever arms.
• l) Traveling nut stops.

• At any time when maintenance is carried out on an actuator, the pipeline should be depressurized and drained.
• Actuators should not be overloaded by placing extension bars in handwheels. On electric, hydraulic or pneumatic drives it is bad practice to drive in an overload condition.
• The valve maker should consider the necessity for fitting a pressure relief valve to relieve pressure in the event of a valve stem seal failure. This can be fitted either in the valve, adaptor flange or the indicator cap of the MASTERGEAR actuator.
• Setting of the actuator stop screw is the responsibility of the valve manufacturer. Once set, these should not be tampered with on site.
• Isolate any electric wiring to limit switches or electric actuators before carrying out any maintenance work (If fitted).
• Ensure that power cannot be accidentally applied. This also applies to any hydraulic/pneumatic power lines.
• Where eyebolts are fitted to actuators, they are to be used for lifting the MASTERGEAR actuator only.

• Ensure that the valve stem, valve interface flange, actuator mounting flange bore, keys, etc. are thoroughly cleaned and debarred before fitting. Coat valve stem with suitable oil or grease to aid fitting. Apply liquid sealant or gasket to flange face, lower actuator into position on the valve. (The actuator bore should be a light clearance fit to the valve stem.) Apply sealant or P.T.F.E. tape to flange bolts and tighten to the required torque, tighten opposing bolts to ensure actuator sits down square and concentric to the valve stem. Reference Fig. A1.

• N.B. Dowel pins should be considered for location and anti-rotation of actuator to valve during operation.
• If any adaptor plate is fitted between the actuator and valve interface flange, this should be fitted to the actuator prior to lowering assembly on to the valve. The adaptor plate should be fitted concentric to the actuator bore. The flange is required to be sealed to the actuator. Dowel pins Should be considered for location and anti-rotation of actuator. Reference Fig. A1 for sealing bolts.

  

  

• For internal fixing screws, apply sealants to the under-side of the screw head and faces. Reference Fig. A2 and A3.
• Refit the actuator cover with a suitable sealant or gasket as supplied. Recommended sealant Loctite 574 or 572.
• Unless otherwise specified, units are supplied grease filled for life, under normal operating conditions, this is 10 years. If the worm box requires filling on installation (normally only if internal fixing screws are customer supplied) remove to cover and pack grease to the top of the quadrant gear teeth. Ensure a minimum of air pockets. N.B. Special greases may be required for high/low temperature, nuclear, oxygen, fire safe or submersible applications.
• Recommended grease is a good quality EP.2 No. 2 consistency which covers max/min operating temperature conditions. Spur boxes and miters are always grease filled for life. Reference Fig. B for grease levels in workbox.
After fitting the actuator to the valve, stop screws should be adjusted to suit the open and closed positions. For electric actuation drive, it is normal to set the open and shut position on the electrical limit stops. The manual actuator stop screws should then be wound down to the quadrant stop pad and wound back one half turn. The manual stop screws then are only contacted in the event of electrical limit switch failure. Fill any cavity above the valve stem, under the indicator cap, with grease to avoid corrosion and ingress of water. Seal indicator cap to quadrant with a suitable sealant. The handwheel is supplied separately from the actuator and will require fitting. This will be secured by a tension pin or a grub screwed and keyed fixing. If electric actuator drive requires fitting, ensure coupling, input shaft, input adaptor face and electric actuator mating face are thoroughly cleaned and debarred before fitting. Fit shaft coupling in correct position on input shaft and tighten grub screw. Mount electric actuator to flanged adaptor, fit and tighten bolts to correct torque. Refer to electric actuator manufacturers‘ instruction. Where angles other than 90° or 180° are required by customers, traveling nut stop assemblies are used in place of stop screws. To adjust, remove the traveling nut stop housing, rotate locknuts/actuator to required open/shut suitable grease and replace the housing. Further details and drawings can be furnished on request.
• Gearboxes with environmental protection IP 65 is not recommended to use on the open air without protection roof. Influence of snow, ice, fog connected with quick temperature changes caused condensation of air wetness inside the gearbox and cumulation of water inside the gearbox.
• Gearboxes which has no position indicator sealed by “o” ring has to sealed in this part by lubrication Vaseline.

• Actuators must be stored in a clean, dry warehouse and protected from variations in temperature range should be between 0°C to 50°C.
• Units should be stored so as to avoid accidental damage.
• At 3 monthly intervals, operate the actuator for one complete open/shut cycle either by handwheel or power device.
• Inspect any unpainted surfaces for rust at 3 monthly intervals. Apply a preservative oil coating if required.
• Maintain records of storage/inspection for the above MASTERGEAR reserves the right to inspect records and units when required.
• If the actuator has been operated every 3 months (see item 4.3) it should be returned to the factory for inspection and refurbishment after 10 years. If it has not been operated during storage, it should be returned after 5 years.

• Mastergear actuators are normally supplied with a red oxide primer finish for the customer to apply finish paint coating. It is the customer‘s responsibility to sufficiently mask off any sensitive areas prior to any painting or shot-blasting and painting work. Attention is drawn to the following sensitive areas:
• a) Input shaft.
• b) Quadrant journals (particularly upper journal beneath the indicator cap).
• c) Quadrant bore.
• d) Actuator mounting face.
• e) Any moving parts on declutch type units or lever arm units.
• f)Electric switches and ancillary equipment.
• The nameplate or instruction plates may be removed temporarily or masked After final painting, clean and apply a small amount of grease around the top quadrant journal as this can wash out with cleaning solvents on the painting process. Failure to pay attention to this detail may result in premature corrosion at this point.

• For manual operation, rotate the handwheel in the desired direction to open or close the valve. Industry standard is clockwise rotation to close. Check that this is the case for your application. Refer to the indicator cap pointer for actual positions of valve seat prior to operation.
• For electric/hydraulic/pneumatic drive refers to the drive manufacturers‘ instructions. Worm declutch units (MVWD, MAWD, MCWD) will normally be in the disengaged position and are only engaged when a pneumatic failure occurs. To engage, lift plunger, raise handle to the position. The handwheel will normally need rotating to help with gear tooth meshing.
• In the cases when gearbox has no covered rubber sealings like SE product line is recommended to protect rubber by special liquids and lubricate shaft with silicon oil every two months..
• There is an instruction plate on the cover of all units. To disengage reverse the engagement procedure. P  Q type declutch units are normally in the disengaged position and are only engaged when a pneumatic or hydraulic failure occurs. On P type declutch units, turn the handle 90 degr. To allow the internal drive key to engage in the valve stem. The handwheel will need rotating to line up the key to the valve stem. Q type declutch operation is exactly as the P type, but the handle has to be held down to engage the key into the stem. Disengage when pneumatic or hydraulic drive is utilized.

• If you will need some spare parts or informations it is necessary to specify series, type, serial number and number of pieces. Type and serial number is on gearbox label.
• When problem with gearbox could not be solved ourselves is necessary to return gearbox to Production Company, where problem will be analyzed and repaired or failed gearbox will be replaced.