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Safety Rules

Pump operation without safety valve as well 

as any excess in temperature or speed limits 

automatically voids the warranty. The safety 

valve must be regulated in accordance with 

the guidelines for liquid spraying units so that 

the admissible operating pressure can not be 

exceeded by more than 10%.

When the pump is in operation, the open shaft 

end must be covered up by shaft protector (21) 

and the driven shaft side and coupling by a bell 

housing; the plunger room should have a cover 

(30).

Before any maintenance to the pump takes 

place, the pressure in discharge line and in 

pump must be at zero. Close up suction line. 

Disconnect fuses to ensure that the driving 

motor does not get switched on accidently.

Make sure that all parts on the pressure side of 

the unit are vented and refilled, with pressure at 

zero, before starting the pump.

In order to prevent air or an air/water-mixture 

being absorbed and to prevent cavitation 

occurring, the pump-npshr (positive suction head 

and water temperature) must be kept under 

control.

Cavitation and/or compression of gases 

lead to uncontrollable pressure-kicks which 

can ruin pump and unit parts and also 

be dangerous to the operator or anyone 

standing nearby.

Giant plunger pumps are suitable for pumping 

clean water and other non-aggressive or 

abrasive media with a specific weight similar to 

water.

Before pumping other liquids - especially 

inflammable, explosive and toxic media 

- the pump manufacturer must, under all 

circumstances, be consulted with regard to 

the resistance of the pump material. It is the 

responsibility of the equipment manufacture 

and/or operator to ensure that all pertinent 

safety regulations are adhered to.

Standard pump with valve casing of seawater-

resistant-bronze.

Figures given for maximum pressure and maximum 

speed (rpm) apply to interval operation. When the 

pump is used in continual operation and/or with 

water warmer than 104°F (40°C), these values must 

be reduced by 10%.

Required NPSH refers to water: Specific weight 

1kg/dm3, viscosity 1

o

E at maximum permissible 

revolutions, using both suction connections.

IMPORTANT!

 Use of both suction connections 

is imperative in order to ensure cavitation-free 

operation and optimal suction conditions. If only one 

connection is used, a safety margin of one meter 

has to be added to the required NPSH.

Operation and Maintenance

Check oil level prior to starting and ensure trouble-

free water supply.

IMPORTANT!

  If there is a 

danger of frost

the water in the pump and in the pump fittings 

(particularly the unloader valve) must be emptied. 

The second discharge port can also be used and the 

pump run “dry” for 1-2 minutes for this purpose.

Oil amount:

 1.6 gallons (6.0 litres). Only use 

Giant’s p/n 01154 or

 

ISO VG 220 industrial gear 

oil

 (e.g. Aral Degol BG220) or 

automobile gear oil 

SAE 90 GL4.

We recommend ISO VG 68 (SAE80) gear oil for low 

ambient temperatures (+41°F/5°C and less).

Initial change after 50 operating hours and then 

every 1000 operating hours, or after 1 year if used 

less.

IMPORTANT!

  When operating in damp places 

or with high temperature fluctuations, oil must be 

changed immediately, should condensate (frothy oil) 

occur in the gear box.

IMPORTANT!

  If the pump is mounted on a vehicle 

(possibility of unlevelness) and/or if the pump speed 

is between 300 rpm and 500 rpm, the oil quantity is 

1.8 gallons (7.0 liters). To check, put the oil dipstick 

in the bore situated beside the eye bolt.

Keep NPSH under control.

Maximum input pressure 145 PSI (10 bar), 

maximum suction head -4.35 PSI (-0.3 bar). Make 

sure that suction pulsation is sufficiently dampened – 

water column resonance must be avoided.

INSTALLATION INSTRUCTIONS

Содержание GP7142

Страница 1: ...fications page 3 Exploded View page 4 Parts List Repair Kits page 5 Repair Instructions page 6 Recommended Spare Parts List page 6 Dimensions page 7 Warranty Information back page Triplex Ceramic Plun...

Страница 2: ...g of seawater resistant bronze Figures given for maximum pressure and maximum speed rpm apply to interval operation When the pump is used in continual operation and or with water warmer than 104 F 40...

Страница 3: ...e Ports 2 1 1 4 NPT Weight 375 lbs 170 kg Crankcase Oil Capacity 1 6 Gal 6 0 liter Fluid End Material Cast Iron NPSHR 28 feet of head 8 5 meters of head For continuous duty and or with fluid temperatu...

Страница 4: ...4 Exploded View GP7142...

Страница 5: ...3 42 07745 V Sleeve 6 43 07744 Pressure Ring 3 44 04324 Spacer Ring 3 45 13297 Tension Spring 3 49 13159 Stud Bolt 8 49A 13160 Hex Nut 8 50 07790 Valve Casing 1 50A 13162 Cylinder Stud 2 51 05594 Inl...

Страница 6: ...in gear box and sealing surfaces of valve casing Push valve casing carefully on O rings of seal case and centering studs 50A Tighten nuts 49A to 103 ft lbs 140 Nm TO DISASSEMBLE GEAR Take out plunger...

Страница 7: ...tor Unloader Check for proper operation Cavitation Check inlet lines for restrictions and or proper size Pump Pressure as Drop at gun Rated Pressure Restricted discharge plumbing Re size discharge plu...

Страница 8: ...tions made by the customer or third party 6 The operation of pumps and or accessories exceeding the specifications set forth in the Operations Manuals provided by Giant Industries Inc Liability under...

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