Description

HT-400 Plunger Pump Parts

HT-400 Triplex Plunger Pump Spare Parts and Subassemblies

SD Hydril Machinery provides a product-focused inquiry page for HT-400 plunger pump spare parts. This catalog organizes parts by assembly, location number, quantity, and part number to help oilfield service companies, maintenance teams, and distributors identify replacement components.

The catalog sections include:

• Push Rod Subassembly — L-2 Spacer
• Fluid-End / Discharge Flange Subassembly
• Discharge Valve Subassembly
• Suction Valve Subassembly
• Plunger / Cylinder Head Cover Subassembly

Compatibility note: The following part numbers and descriptions are transcribed from the supplied reference list. Confirm the original equipment documentation, pump configuration, plunger size, and part number before ordering. Brand and model references are for identification purposes only.

1. Push Rod Subassembly — L-2 Spacer

Loc.	Part Description	Qty	Part Number
1	Retainer, Push Rod, HT-400TM, Two Piece Nose, L-Spacer	3	316.21066
2	O-Ring, 90 Duro, 1 7/8 × 1 5/8 × 1/8, 568-223	3	8.34020
3	Tie Rod, Push Rod, L-Spacer, HT-400TM	3	316.25166
4	Push Rod, Two Piece, L-Spacer, HT-400TM	3	316.21065
5	Retainer, Push Rod Seal Housing, L-2 Spacer, HT-400TM	3	316.10012
6	Housing, Push Rod Seal, Floating, L-2 Spacer, HT-400TM	3	316.10013
7	O-Ring, 70 Duro, 5 11/16 × 5 1/2 × 3/32, 568-161	3	70.33739
8	Seal, Push Rod, L-Spacer, HT-400TM	6	316.10014

2. Fluid-End / Discharge Flange Subassembly

HT-400 Fluid-End Components by Plunger Size

Loc.	Part Description	Qty	3-3/8 in	4 in	4-1/2 in
1	Flange, Discharge, HT-400TM, Blank	1	—	316.22980	316.22980
1a	Flange, Discharge, HT-400TM, Curved, Right Hand	1	316.21676	316.23019	316.23019
1b	Flange, Discharge, HT-400TM, Curved, Left Hand	1	316.21677	316.23017	316.23017
2	Seal, Discharge Passage, HT-400TM	6	315.27117	316.2547	316.2547
3	Nut, 1-14 NF, Internal Wrenching, 1.03 TL	4	316.11621	316.11621	316.11621
4	Stud, HT-400TM Fluid End to Thick Discharge Flange	4	316.23013	—	316.23013
5	Bolt, Tie, 1.375-12 UNF × 32.4 in., Top, Fluid End, HT-400TM, TC	1	316.27488	316.27488	316.27488
6	Nut, Top Tie Bolt, HT-400TM, TC	2	316.25501	316.25501	316.25501
7	Washer, Hardened, 2.31 OD × 1.43 ID, for Top Tie Bolt	2	316.22493	316.22493	316.22493
8	Spacer, Inner, Discharge Passage Seal, HT-400TM	2	316.2145	316.2545	316.2545
9	Fluid End Section, HT-400TM Pump, Not Sleeved	3	316.21951	316.22982	316.23951
10	Nut, Elastic Stop, 3/4 in., 16 NF	2	70.32760	—	70.32760

3. Discharge Valve Subassembly

Discharge Valve Parts by Plunger Size

Loc.	Part Description	Qty	3-3/8 in	4 in	4-1/2 in
1	Retainer, Cover, HT-400TM	3	316.2102	316.2202	316.2202
2	Cover, Discharge, Double Guided Valve, HT-400TM	3	316.2107	316.23091	316.23091
3	Gasket, Discharge Valve & Cylinder Head Cover, HT-400TM	3	316.21052	316.22052	316.22052
4	Ring, Spacer, Discharge Valve & Cylinder Head Cover, HT-400TM	3	316.21051	316.22051	316.22051
5	Liner, Two-Piece Bushing, Valve Guide, HT-400, Brass	6	316.22005	316.22005	316.22005
6	Insert, Two-Piece Bushing, Valve Guide, Special, HT-400	6	316.22004	316.22004	316.22004
7	Spring, Valve, HT-400TM, 36 lb/in	3	316.2108	316.2108	316.2308
8	Valve, HT-400, Frac	3	316.21007	316.21007	316.22048
9	Insert, Valve, HT-400TM, Urethane, Acid/Frac Service (Yellow)	3	316.21048	316.21048	316.22046
9	Insert, Valve, HT-400TM, Urethane, Standard Service (Brown)	3	316.21006	316.21006	316.22049
10	Valve Seat, HT-400TM, Tapered	3	316.21008	316.21008	316.210047
11	O-Ring, 90 Duro	3	8.34037	8.34037	8.34041

4. Suction Valve Subassembly

Suction Valve Parts by Plunger Size

Loc.	Part Description	Qty	3-3/8 in	4 in	4-1/2 in	5 in	6 in
1	Retainer, Stop and Spring, HT-400TM, Machined Cast	3	316.22977	316.22977	316.22242	316.25840	316.25840
2	Boot, Suction and Stop, HT-400TM	6	316.25233	316.25233	316.25233	316.25233	316.25233
3	Spring, Lock, HT-400	3	316.2125	316.2125	316.22252	316.22253	316.22253
4	Liner, Two-Piece Bushing, Valve Guide, HT-400TM, Brass	6	316.22005	316.22005	316.22005	316.22007	316.22007
5	Insert, Two-Pie