How do I tell if my Parker pump has Buna or Viton seals?

Read the seal position of the model code. On a PVP, no letter means Nitrile (Buna-N) and a V means Fluoroelastomer (Viton / FKM). On a Gold Cup the seal code is a digit, 1 is Nitrile, 4 is EPR and 5 is Fluorocarbon. Match the seal to the fluid: Buna in a hot system or on a phosphate ester fluid will swell and fail early, so above roughly 180 degrees Fahrenheit or on any non-petroleum fluid, choose Viton.

What is a Parker serial number lookup?

Parker does not publish a public serial-number lookup tool. The serial number identifies the individual unit and its build date for warranty purposes, but the model code, not the serial, is what determines the service parts. Decode the model code first. Where a date or design code is present, as on the Torqmotor, it matters because it changes which seal kit fits.

Parker Model Code Decoder

Q: Where is the model number on a Parker hydraulic pump?

On the nameplate, which sits on a machined flat on the housing, usually beside or opposite the ports. It carries the model code, a serial number and on most families a design or date code. If the plate is painted over, missing or unreadable, the casting numbers on the housing and end cover will still identify the frame size, and photographs of the shaft, mounting flange and port pattern are usually enough for us to identify the unit.

Q: How do I identify a Parker gear pump?

Parker gear units start with PGP for a pump or PGM for a motor, followed by the series number, 05, 315, 330, 350, 365, 500, 511, 517, 620 or 640. The characters after that read as a fixed sequence: unit type, shaft end cover and rotation, mounting flange, port end cover, gear housing, gear width and shaft type. Gear width is the displacement: on a 330 series, 05 is a 1/2 inch gear at 0.99 in3/rev and 20 is a 2 inch gear at 3.94 in3/rev. Cast-iron 300 and 400 series units are built in Youngstown, Ohio; the aluminum 500 and 600 series come from Chemnitz.

Q: How do I identify a Parker hydraulic motor?

Most Parker low-speed high-torque motors are Torqmotors and carry a T-prefix, TB, TC, TE, TF, TG, TH, TJ, TL or TS, followed by a four-digit displacement, a two-letter mounting and porting pair, a shaft code, a rotation digit and a four-character option group. For example TC0045AS010AAAB. Gold Cup motors instead start with M and a displacement number such as M11 or M24. PGM is a gear motor.

Q: Why does my Parker part number return no results?

Because Parker acquired several hydraulics brands and many units are still cataloged under the original name. Denison became Parker Denison, the T6, T7 and T67 vane pumps and the Gold Cup piston range. Commercial Intertech became Parker Commercial, the C and G series dump pumps and much of the gear pump line. Ross Gear became Parker Torqmotor, so an MB, MF or MG motor is now a TB, TF or TG. VOAC became the F11, F12 and VP1 range. Searching under the original brand usually finds the part.

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Every Parker Family Decoded

Denison · Commercial · Ross Cross-Referenced

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Obsolete & Hard-to-Find Parts

Five Steps to Decode a Parker Model Code

Find the nameplate

Look on the machined flat of the housing, beside or opposite the ports. Parker stamps or laser-etches a plate carrying the model code, a serial number and, on most families, a design or date code. On a Torqmotor it is on the flat opposite the ports.

Read the prefix

The first two or three characters name the family. Use the prefix table below, it will tell you what you are holding and which original brand it traces back to.

Decode the model string

Every Parker code reads left to right through fixed fields: displacement, mounting and porting, shaft, rotation, seals and control. Those fields determine every service part in the unit.

Check the seal material and design series

The seal character decides which kit fits. On a Torqmotor the date code decides it instead. This is where most wrong orders happen.

If nothing matches, check the original brand

A Parker number that returns no results is usually a Denison, Commercial Intertech, Ross or VOAC unit still cataloged under its original name.

Not Sure Which Family You Have?

This page decodes the model string once you know the family. If you only have a number and no idea what built it, start with the router instead: it sorts any Parker code into the company that originally made it, which is the fastest way to narrow a Parker-badged pump.

Which Parker pump do you have? Start with the identification router →

Most Parker-badged industrial pumps are Parker Denison. If your code starts with T6, T67, T7, or P followed by a number, it decodes with the Denison model code, not a Parker one. Go to the Denison model code decoder.

Torqmotor Motor Code - TB TC TE TF TG TH TJ TL TS

TC0045AS010AAAB

TC Series 0045 Displacement AS Mount / Port 01 Shaft 0 Rotation AAAB Options

Displacement	0036 = 2.2 in³/rev up to 0960 = 58.5 in³/rev
Mounting	A SAE A 2-bolt · B SAE B 2-bolt · F 4-bolt · M Standard 4-bolt · U Wheel · H Wheel, machined pilot · L Wheel, brake mount · G Clutch motor
Porting	S 7/8" O-ring · P 1/2" NPTF · T 1/2" BSPF · F 3/4" O-ring · M Manifold · A B E Rear port axial / radial / manifold
Options	AAAB no paint · AAAC corrosion-resistant paint · AABJ free-running rotor set · BBCM/BBCP/BBCT/BBCK/BBCN internal relief at 1200/1450/1560/1740/2030 PSI

🔎 The date code decides the seal kit, not the model code. Torqmotors built before date code 34824 take the legacy kits SK000090 (Buna-N) or SK000091 (Viton). Later motors take SK000472 or SK000473. Full breakdown on the Parker Torqmotor parts page.

Gear Pump Code - PGP / PGM 300 & 400 series

Pump or motor	P Pump · M Motor, the letter after PG
Series	05 aluminum micro · 315 330 350 365 cast iron (Youngstown, Ohio) · 500–640 aluminum (Chemnitz)
Unit	A single · B tandem, flush studs · C two-piece shaft, outboard bearing required · L extended studs
Shaft end cover	1 pump CW · 2 pump CCW · 4 pump CW with outboard bearing · 5 pump CCW with O.B. · 8/9 bi-rotational motor
Mounting flange	42 SAE B 4-bolt · 78 SAE C 4-bolt · 97 SAE B 2-bolt
Gear housing	AB pump · EB motor (side ported)
Gear width = displacement	05 1/2" = 0.99 in³ · 07 3/4" = 1.48 · 10 1" = 1.97 · 12 1¼" = 2.46 · 15 1½" = 2.96 · 17 1¾" = 3.45 · 20 2" = 3.94 in³/rev
Shaft type	25 SAE B spline · 30 SAE B keyed · 98 SAE BB splined · 43 SAE BB keyed · 7 SAE C spline (two-piece only)

Pressure falls as the gear gets wider. On a 330 series, gear widths 05 through 15 are rated 3500 PSI, the 17 drops to 3250 PSI and the 20 to 3000 PSI. A wider gear is more flow, not more pressure.

Piston Pump Codes - PVP · P1 / PD · P2 / P3 · Gold Cup

PVP	Displacement 16–48 cc/rev · rotation R/L · pressure range 10/20/30/36 (×100 PSI) · ports · shaft · seals: omit = Buna-N, V = Viton · control. PVP parts →
P1 / PD	P1 mobile · PD industrial. Then configuration M/S · displacement · mounting & ports S/A/M/B · port orientation E end / R side with ripple chamber / T side with thru-drive · shaft 01 SAE B-B 15T spline, 02 SAE B-B 1" keyed, 04 ISO 25 mm keyed, 08 SAE B 13T spline · rotation R/L · controls C0/C1 pressure limiter, L0/L2 load sensing · paint 00/PB. P1 parts →
P2 / P3	Displacement 060 3.7 in³ · 075 4.6 · 105 6.4 · 145 8.8 · mounting flange B SAE B 2-bolt / C SAE C / D SAE D 4-bolt · controls PA max pressure, LA/LB load sensing, TA–TD torque limiting · rotation R/L viewed from the shaft. P2 parts →
Gold Cup	P pump / M motor · displacement 6 6.0 in³ · 7 7.25 · 8 8.0 · 11 11.0 · 14 14.0 · 24 24.6 · 30 30.6 · type F fixed, G fixed with shuttle, M fixed thru-drive, V variable · shaft 2 keyed SAE mechanical seal, 3 splined, 7/8 double lip · rotation R/L · seals 1 Nitrile, 4 EPR, 5 Fluorocarbon
PAVC	Frame 33 / 38 / 65 / 100. Two-piece cast-iron housing, replaceable bronze-clad port plate, cartridge controls. 3000 PSI continuous, 3600 PSI peak, 600–3000 RPM. PAVC parts →

Match the seal to the fluid, not to what came out. Buna-N in a hot system or on a phosphate ester will swell and fail early. Above roughly 180 °F, or on any non-petroleum fluid, choose Viton / fluorocarbon. If you are unsure, tell us the fluid and operating temperature and we will spec the kit.

Frequently Asked Questions

Where is the model number on a Parker hydraulic pump?

On the nameplate, on a machined flat beside or opposite the ports. It carries the model code, a serial number and usually a design or date code. If the plate is gone, the housing and end cover castings still identify the frame, and photographs of the shaft, flange and port pattern are normally enough.

How do I identify a Parker gear pump?

PGP is a pump, PGM a motor, followed by the series, 05, 315, 330, 350, 365, or 500 through 640. The characters after that give unit type, rotation and outboard bearing, mounting flange, port end cover, gear housing, gear width and shaft. Gear width is the displacement.

How do I identify a Parker hydraulic motor?

A T-prefix, TB, TC, TE, TF, TG, TH, TJ, TL or TS, is a Torqmotor, read as series, displacement, mount/port, shaft, rotation, options. An M with a displacement number is a Gold Cup motor. PGM is a gear motor.

Why does my Parker part number return no results?

Parker absorbed Denison, Commercial Intertech, Ross Gear and VOAC, and many units are still cataloged under the original brand. An MB, MF or MG motor is now a TB, TF or TG Torqmotor; a Commercial Intertech gear pump is now a PGP. Search the original brand.

Is there a Parker serial number lookup?

Not publicly. The serial identifies the individual unit and its build date; the model code is what determines service parts. Decode that first. Where a date or design code exists, as on the Torqmotor, it matters, because it changes which seal kit fits.

Can you identify my pump from a photo?

Yes, and there is no charge. Send a photo of the nameplate if it is readable, plus shots of the shaft end, mounting flange and port face. We identify Parker, Denison, Commercial, Ross and VOAC units daily and will come back the same day.

Send us a nameplate photo and we will identify it free.
Model code unreadable? Photos of the shaft, flange and ports are usually enough.
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