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9

Repair Instructions P420 / P420-0011 / P420-0021 / P422 / P423 and P425 

 

Note: Always take time to lubricate all metal and nonmetal parts with a light film of oil before reassembly.  This step 

will ensure proper fit, at the same time protecting the pump nonmetal parts (i.e., the elastomers) from cutting and 

scoring.

1)  With a socket wrench, 

remove the three dis-

charge valve plugs and 

three inlet valve plugs 

(32).  Inspect the o-ring 

(33) for wear and replace 

if damaged.

2)  Using  needle  nose  pli-

ers, remove the inlet and 

discharge  valve  assem-

blies  (27A).      Note:  It 

may become neccesary 

to remove the valve seat 

(27) from the valve casing 

using a slidehammer.

 

3)  By inserting a small screw 

driver  between  the  valve 

seat  (27)  and  the  valve 

spring  retainer  (30),  the 

valve  assembly  can  be 

separated.  

4)  Remove the o-ring (31).  

 

Inspect all parts for wear and 

replace as necessary. Apply 

one drop of loctite 243 to the 

valve plugs (32) and tighten 

to 107 ft.-lbs. (145 NM).

5)  Use a 8mm allen wrench 

to  remove  the  8  socket 

head  cap  screws  (34). 

Carefully  slide  the  valve 

casing  (26)  out  over  the 

plungers. 

6)  Remove seal case (20) 

and weep return rings 

(25) from the valve 

casing.

7)  Remove the pressure 

rings (24) and v-sleeves 

(23 - Note: P422 & P423 

pumps have a spacer 

ring) from the valve cas-

ing (26).  

8)  Remove the weep grooved 

seal (23 or 23B) together 

with pressure ring (24) 

P420 and P425 only) out 

 

of the seal case (20). 

Check O-rings (21).

IMPORTANT!

 The grooved 

seal (23) on the high-

pressure side is to be fitted 

carefully into the valve cas-

ing (26) using a screwdriver. 

Under no circumstances 

must the seal surface in the 

valve casing or the seal lip 

be damaged.

Содержание P400 Series

Страница 1: ...Kits page 7 Pump Specifications P425 page 8 Repair Instructions Torque Specs pages 9 10 Trouble Shooting Chart page 11 Recommended Spare Parts List page 11 Dimensions back page Warranty Information back page Updated 06 18 Triplex Ceramic Plunger Pump Operating Instructions Repair and Service Manual For Models P420 P420 0011 P420 0021 P422 P423 P425 ...

Страница 2: ...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 dis charge port cal also be used and the pump run dry for 1 2 minutes for this purpose Oil amount 30 4 ounces 0 9 liters Only use ISO VG 220 industrial gear oil e g Aral Degol BG220 or automobile gear oil SAE 90 GL4 Giant p n 01154 Initial oil change aft...

Страница 3: ...e or more of the limits specified above SPECIAL NOTE The theoretical gallons per revolution gal rev is 0 00883 To find specific outputs at various RPM use the formula GPM 0 00883 x RPM U S Metric Volume Up to 12 8 GPM 48 4 L min Discharge Pressure Up to 2175 PSI 150 bar Maximum Power Consumption 19 2 BHP 14 3 kW Inlet Pressure 4 35 to 145 PSI 3 to 10 bar Stroke 0 945 24mm RPM Up to 1450 RPM Plunge...

Страница 4: ...formula HP GPM X PSI 1450 SPECIAL NOTE The theoretical gallons per revolution gal rev is 0 00683 To find specific outputs at various RPM use the formula GPM 0 00683 x RPM Specifications Model P422 U S Metric Volume Up to 9 9 GPM 37 3 LPM Discharge Pressure Continuous Up to 2610 PSI 180 bar Discharge Pressure Intermittent Up to 3000 PSI 200 bar Maximum Power Consumption 17 7 BHP 13 2 kW Inlet Press...

Страница 5: ...mp horse power requirements use the following formula HP GPM X PSI 1450 SPECIAL NOTE The theoretical gallons per revolution gal rev is 0 00566 To find specific outputs at various RPM use the formula GPM 0 00566 x RPM Specifications Model P423 U S Metric Volume Up to 8 2 GPM 31 1 LPM Discharge Pressure Up to 2900 PSI 200 bar Maximum Power Consumption 16 4 BHP 12 2 kW Inlet Pressure 4 35 to 145 PSI ...

Страница 6: ...6 EXPLODED VIEW P420 P420 0011 P420 0021 P422 P423 AND P425 PUMPS ...

Страница 7: ...23B 12255 0010 Weep Seal Viton J 3 23B 12255 0020 Weep Seal Teflon K 3 23B 13390 Weep Seal B G 3 24 08376 Pressure Ring A H J K 6 24 06252 Pressure Ring B G 3 25 08394 Weep Return Ring A H J K 3 25 06254 Weep Return Ring B G 3 26 08395 Manifold 1 27A 08408 Valve Assembly A B G H 6 27A 08408 0001 Valve Assembly J K 6 27 08370 Valve Seat 6 28 06791 0100 Valve Plate 6 29 06377 0100 Valve Spring 6 30 ...

Страница 8: ...equirements use the following formula HP GPM X PSI 1450 SPECIAL NOTE The theoretical gallons per revolution gal rev is 0 00738 To find specific outputs at various RPM use the formula GPM 0 00738 x RPM Specifications Model P425 U S Metric Volume Up to 10 7 GPM 40 4 LPM Discharge Pressure Up to 2465 PSI 170 bar Maximum Power Consumption 18 1 BHP 13 5 kW Inlet Pressure 4 35 to 145 PSI 3 to 10 bar Str...

Страница 9: ...27 and the valve spring retainer 30 the valve assembly can be separated 4 Remove the o ring 31 Inspect all parts for wear and replace as necessary Apply one drop of loctite 243 to the valve plugs 32 and tighten to 107 ft lbs 145 NM 5 Use a 8mm allen wrench to remove the 8 socket head cap screws 34 Carefully slide the valve casing 26 out over the plungers 6 Remove seal case 20 and weep return rings...

Страница 10: ...08092 Plug with Gasket 59 ft lbs 80 Nm 6 01010 Screw 111 in lbs 12 5 Nm 10 07114 Screw with Washer 133 in lbs 15 Nm 15B 05349 Connecting Rod Screw 97 in lbs 11 Nm 16D 08399 Tensioning Screw Loctite 243 20 7 ft lbs 28 Nm 32 08373 Plug Loctite 243 107 ft lbs 145 Nm 34 08396 Cap Screw Lightly Oil 30 ft lbs 40 Nm Repair Instructions P420 P420 0011 P420 0021 P422 P423 and P425 11 If oil leaks under und...

Страница 11: ...sure Drop leaks correctly sized inlet plumbing to pump Accumulator pressure Recharge Replace accumulator Unloader Check for proper operation Cavitation Check inlet lines for restrictions and or proper size Pressure Drop at Gun Restricted discharge plumbing Re size discharge plumbing to flow rate of pump Excessive Worn plungers Replace plungers Leakage Worn packing seals Adjust or Replace packing s...

Страница 12: ...tions made by the customer or third party 6 The operation of pumps and or accessories exceeding the specifications set forth in the Opera tions Manuals provided by Giant Industries Inc Liability under this warranty is on all non wear parts and limited to the replacement or repair of those products returned freight prepaid to Giant Industries which are deemed to be defective due to workmanship or f...

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