Parts for Truck/Trailer Mounted Drilling Rig & Workover Rig

1

Rexroth R 431003427 2BA-1/P54692-2/IA-198

Valve body: Forged 42CrMo alloy steel with quenching-tempering treatment; Valve core: Tungsten carbide coating on alloy steel; Seal components: Perfluoroelastomer (FFKM) for high-pressure resistance; Fasteners: Stainless steel 316L

1. Abrasive wear of valve core caused by solid particles in contaminated hydraulic oil; 2. Fatigue damage of seal rings due to frequent pressure cycles in rig hoisting operations

1. Use hydraulic oil meeting NAS 7 cleanliness standard and install a high-precision (10μm) filter in the hydraulic circuit; 2. Regularly inspect seal compression and replace aged seals every 3 months under high-frequency operation, following API Spec 6A maintenance guidelines

2

Rexroth R 431004994 2HA-1/P59331(1/4)/IA-191

Housing: WCB carbon steel with anti-corrosion plating; Internal piston: Chromium-plated alloy steel; Spring: Inconel 718 alloy with high-temperature resistance; Seal rings: Fluororubber (FKM)

1. Deformation of spring due to high ambient temperature near the drilling rig's power system; 2. Eccentric wear of piston caused by installation misalignment under strong vibration

1. Equip heat insulation shielding for components near the power system and monitor ambient temperature (≤120℃); 2. Calibrate installation coaxiality within 0.05mm before assembly and use shock-absorbing mounting brackets

3

Rexroth R 431003063 H-1-A/P52971-1

Valve seat: Wear-resistant ceramic composite material; Valve stem: Nitrided alloy steel; Body: Cast aluminum alloy with anodizing; Seal rings: Nitrile rubber (NBR) with oil resistance

1. Cavitation damage to valve seat caused by sudden pressure release during rig emergency braking; 2. Corrosion of valve stem due to moisture intrusion in hydraulic oil

1. Install a pressure relief buffer valve to avoid abrupt pressure drops; 2. Add a moisture absorber in the hydraulic oil tank and test oil water content weekly (≤0.1%)

4

Rexroth R 431003806 8P-1S/P55556-3

Cylinder barrel: Precision honed 45# seamless steel; Piston: Cast iron with wear-resistant coating; Guide sleeve: Copper-lead alloy with self-lubricating property; Seal rings: Polyurethane (PU)

1. Dry friction wear of piston and cylinder barrel due to insufficient lubrication; 2. Scratching of cylinder inner wall caused by foreign matter entering during maintenance

1. Inject high-pressure hydraulic lubricating oil (ISO VG 46) at regular intervals and inspect lubrication system pressure monthly; 2. Use clean maintenance tools and cover component ports with dust caps when disassembling

5

Rexroth R 431002914 HE-2-FX/P51612-3

Valve body: Alloy steel 40Cr; Spool: Chromium-plated precision steel; Spring: High-carbon steel with heat treatment; Seal rings: Fluororubber (FKM)

1. Wear of valve seat caused by frequent switching operations in drilling feed control; 2. Spring fatigue due to excessive pressure fluctuation in the hydraulic system

1. Control switching frequency within 8 times per minute and measure valve seat wear depth quarterly (replace if >0.1mm); 2. Install a pressure stabilizer to keep system pressure fluctuation within ±2MPa

6

Rexroth R 431002823 HD-2-FX/P50970-1

Housing: Engineering plastic (PA66) with glass fiber reinforcement; Internal components: Powder metallurgy alloy; Seal rings: Nitrile rubber (NBR)

1. Impact damage to housing caused by rig transportation vibration; 2. Abrasion of internal components due to lack of lubrication in dusty oilfield environments

1. Use shock-absorbing packaging during transportation and fasten components with anti-loosening bolts; 2. Inject dust-proof lubricating grease every 2 months and install dust shields at component interfaces

7

Rexroth R 431002613 H-1/P50208-1

Valve core: Wear-resistant ceramic; Valve body: Forged carbon steel; Seal rings: Perfluoroelastomer (FFKM); Connector: Brass with nickel plating

1. Corrosion of connector caused by salt spray in offshore oilfield operations; 2. Valve core jamming due to hydraulic oil oxidation and sludge accumulation

1. Apply anti-corrosion coating to connectors and inspect monthly in offshore environments; 2. Add oil antioxidant to hydraulic oil and replace oil every 6 months under continuous operation

8

Rexroth R 431005003 2HA-2/P59335

Main body: 42CrMo alloy steel; Piston rod: Chromium-plated alloy steel; Seal rings: Fluororubber (FKM); Guide sleeve: Aluminum bronze alloy

1. Eccentric wear of piston rod due to uneven load in rig hoisting; 2. Seal failure caused by high-temperature radiation from rig engines

1. Inspect hoisting load distribution regularly and adjust to ensure uniform force on the piston rod; 2. Install heat insulation plates between components and engine, and monitor working temperature ≤100℃

9

Rexroth R 431002819 H-4/P050967-2

Valve body: WCB carbon steel; Spool: Alloy steel with carburizing treatment; Spring: Stainless steel 304; Seal rings: Polyurethane (PU)

1. Wear of spool caused by contaminated hydraulic oil containing iron filings; 2. Loosening of valve adjusting screws due to rig vibration leading to abnormal wear

1. Install a magnetic filter in the hydraulic system to remove iron filings; 2. Lock adjusting screws with lock nuts and check torque weekly according to DIN 946 standard

10

Rexroth R 431008258 PD40041-0098/IA-514

Sensor probe: 316L stainless steel; Housing: Die-cast aluminum with electrophoresis coating; Connector: IP67 waterproof brass; Seal rings: Silicone rubber

1. Damage to sensor probe caused by collision with drilling tools during maintenance; 2. Poor contact of connector due to water and dust intrusion

1. Install protective sleeves for sensor probes and mark warning zones; 2. Use waterproof connector covers and check sealing performance monthly

11

Rexroth R 431003808 8P/P55557-3

Cylinder barrel: High-pressure seamless alloy steel; Piston: Composite material with carbon fiber reinforcement; Seal rings: Fluororubber (FKM); Fasteners: High-strength alloy steel

1. Deformation of cylinder barrel due to overpressure in emergency hoisting; 2. Abrasion of piston seal caused by hydraulic oil contamination

1. Install an overload pressure relief valve to limit maximum pressure within rated range; 2. Regularly test hydraulic oil cleanliness and replace filter elements when contamination exceeds NAS 8

12

Rexroth R 431002837 HC-2-X/P50975-3

Valve body: Alloy steel 40CrNiMoA; Valve core: Nitrided steel; Seal rings: Perfluoroelastomer (FFKM); Spring: Inconel alloy

1. Fatigue wear of valve core due to long-term continuous operation; 2. Corrosion of valve body caused by acidic components in hydraulic oil

1. Arrange regular operation intervals to avoid continuous work for more than 8 hours; 2. Test hydraulic oil pH value monthly (maintain 6.5-8.5) and replace oil if acidic

13

Rexroth R 431005927 2-HA-2L/P061966-00000

Housing: Forged aluminum alloy; Internal gears: Alloy steel with grinding treatment; Seal rings: Nitrile rubber (NBR); Shaft: Chromium-plated alloy steel

1. Gear wear caused by insufficient lubrication; 2. Shaft wear due to misalignment of transmission components

1. Inject industrial gear oil (ISO VG 220) every month and clean gear meshing surfaces; 2. Calibrate transmission coaxiality quarterly and adjust if deviation exceeds 0.04mm

14

Rexroth R 431002833 HD-2-X/P050973-0003

Valve body: Engineering plastic (PC) with high impact resistance; Valve core: Brass with chrome plating; Seal rings: Silicone rubber; Spring: Stainless steel 301

1. Housing cracking caused by accidental impact during rig site operations; 2. Spring fatigue due to frequent pressure changes

1. Install protective guards around components in high-traffic areas; 2. Avoid frequent and drastic pressure adjustments and inspect spring elasticity semi-annually

15

Rexroth R 431002654 H-2-LX/P50499-3

Main body: 45# steel with quenching treatment; Seal rings: Fluororubber (FKM); Guide sleeve: Copper alloy; Connector: Stainless steel 316L

1. Abrasion of guide sleeve caused by dust and sand in desert oilfield environments; 2. Seal damage due to low-temperature brittleness in cold regions

1. Install sand-proof covers and clean guide sleeves weekly; 2. Use low-temperature resistant seal rings (-40℃ to 120℃) in cold regions and preheat components before startup

16

Rexroth R 431002820 H-4/P50967-3

Valve body: Cast iron (HT250); Valve core: Chromium-plated steel; Seal rings: Polyurethane (PU); Spring: High-carbon steel

1. Valve core jamming caused by scale accumulation in humid environments; 2. Wear of valve seat due to frequent switching

1. Keep component working environment dry and use dehumidifiers if necessary; 2. Inspect valve seat surface quarterly and grind or replace if worn

17

Rexroth R 431002831 HD-2-X/P050973-1

Housing: Die-cast zinc alloy with anti-corrosion coating; Internal components: Precision-machined steel; Seal rings: Nitrile rubber (NBR); Fasteners: Stainless steel

1. Corrosion of housing caused by rainwater and chemical agents in oilfields; 2. Loosening of fasteners due to rig vibration leading to component misalignment

1. Cover components with waterproof casings in outdoor operations; 2. Use spring washers and check fastener tightness weekly

18

Rexroth R 431003040 P52935-4

Pump body: Cast aluminum alloy; Impeller: Copper alloy; Shaft seal: Mechanical seal with silicon carbide faces; Housing: Engineering plastic

1. Impeller wear caused by solid particles in hydraulic oil; 2. Shaft seal leakage due to excessive shaft runout

1. Install a double-layer filter (5μm precision) at the oil inlet; 2. Calibrate shaft runout within 0.03mm and replace bearings if worn

19

Rexroth R 431003664 4-S/P55161

Valve body: Alloy steel 40Cr; Valve core: Tungsten carbide; Seal rings: Perfluoroelastomer (FFKM); Spring: Inconel 625

1. Cavitation damage to valve core caused by sudden pressure release; 2. Spring deformation due to high-temperature operation

1. Install a pressure buffer to slow down pressure release rate; 2. Monitor working temperature and ensure it does not exceed 150℃, install cooling devices if necessary

20

Rexroth R 431003665 6-S/P55162

Main body: Forged 42CrMo steel; Seal rings: Fluororubber (FKM); Guide sleeve: Self-lubricating bearing alloy; Connector: Brass

1. Abrasion of guide sleeve caused by lack of lubrication; 2. Connector corrosion caused by saltwater in coastal oilfields

1. Use self-lubricating guide sleeves and inspect lubrication performance monthly; 2. Apply anti-corrosion paint to connectors and clean with fresh water after coastal operations

21

Rexroth R 431003826 HC-2-LX/P55582-3

Valve body: WCB carbon steel; Valve core: Chromium-plated alloy steel; Seal rings: Polyurethane (PU); Spring: Stainless steel 304

1. Wear of valve core due to hydraulic oil contamination; 2. Seal aging caused by long-term exposure to sunlight in outdoor operations

1. Regularly replace hydraulic oil and filter elements; 2. Install sunshades for outdoor-mounted components and replace seals every 4 months

22

Rexroth R 431004997 2 HA-1L/P59332-1

Housing: Engineering plastic (PA66); Internal gears: Alloy steel; Seal rings: Nitrile rubber (NBR); Shaft: Alloy steel with heat treatment

1. Gear wear caused by foreign matter entering the gear chamber; 2. Shaft damage due to overload torque

1. Install dust-proof seals at gear chamber openings; 2. Avoid overloading the transmission system and install torque limiters

23

Rexroth R 431005000 2 HA-1R/P59333

Valve body: Alloy steel 40Cr; Valve core: Nitrided steel; Seal rings: Fluororubber (FKM); Fasteners: High-strength steel

1. Valve core jamming due to sludge accumulation in hydraulic oil; 2. Fastener corrosion caused by oilfield chemicals

1. Add oil detergent to hydraulic oil and clean the system annually; 2. Use corrosion-resistant fasteners and apply anti-chemical coating

24

Rexroth R 431005006 2 HA-2L/P59336-3

Cylinder barrel: Precision honed seamless steel; Piston rod: Chromium-plated 42CrMo; Seal rings: Perfluoroelastomer (FFKM); Guide sleeve: Copper alloy

1. Eccentric wear of piston rod due to improper installation; 2. Seal failure caused by high-pressure impact

1. Ensure installation coaxiality and use alignment tools during assembly; 2. Install a shock absorber in the hydraulic circuit to reduce pressure impact

25

Rexroth R 431005013 2-HA-2Z/P059339-0

Housing: Forged steel; Internal components: Powder metallurgy; Seal rings: Nitrile rubber (NBR); Connector: Stainless steel 316L

1. Impact damage to housing during rig assembly and disassembly; 2. Abrasion of internal components due to lack of lubrication

1. Use lifting tools with soft slings during handling; 2. Inject lubricating grease regularly and follow the manufacturer's lubrication schedule

26

Rexroth R 431005441 P060266-1

Valve body: Cast iron (HT200); Valve core: Brass; Seal rings: Polyurethane (PU); Spring: High-carbon steel

1. Valve seat wear caused by frequent switching; 2. Corrosion of valve body in humid environments

1. Inspect valve seat wear regularly and replace if necessary; 2. Keep the working environment dry and ventilated

27

Rexroth R 431005733 2-HA-3/P61266

Main body: 42CrMo alloy steel; Piston: Composite material; Seal rings: Fluororubber (FKM); Guide sleeve: Aluminum bronze

1. Piston wear caused by hydraulic oil contamination; 2. Guide sleeve wear due to misalignment

1. Maintain hydraulic oil cleanliness and replace filters regularly; 2. Calibrate component alignment quarterly

28

Rexroth R 431007308 H-2-FX/P068521-00002

Valve body: Alloy steel 40CrNiMoA; Valve core: Tungsten carbide; Seal rings: Perfluoroelastomer (FFKM); Spring: Inconel alloy

1. Fatigue wear of valve core due to long-term continuous operation; 2. Spring deformation due to high temperature

1. Arrange periodic maintenance intervals and inspect valve core wear; 2. Install cooling systems to control working temperature

29

Rexroth R 431002825 HD-2-FX/P50970-3

Housing: Engineering plastic; Internal components: Steel; Seal rings: Nitrile rubber (NBR); Fasteners: Stainless steel

1. Housing damage caused by vibration; 2. Seal leakage due to improper installation

1. Use shock-absorbing mounting brackets; 2. Ensure proper seal installation and check compression degree

30

Rexroth R 431002818 H-4/P50967-1

Valve body: WCB carbon steel; Valve core: Chromium-plated steel; Seal rings: Polyurethane (PU); Spring: Stainless steel

1. Valve core jamming due to foreign matter; 2. Spring fatigue due to frequent pressure changes

1. Install filters to prevent foreign matter entry; 2. Avoid frequent pressure adjustments and inspect spring performance

31

Rexroth R 431002912 HE-2-FX/P51612-1

Main body: Alloy steel; Seal rings: Fluororubber (FKM); Guide sleeve: Copper alloy; Connector: Brass

1. Guide sleeve wear caused by lack of lubrication; 2. Connector corrosion in harsh environments

1. Lubricate guide sleeves regularly; 2. Apply anti-corrosion coating to connectors

32

Rexroth R 431002640 H-2-X/P50493-3

Valve body: Cast iron; Valve core: Brass; Seal rings: Nitrile rubber (NBR); Spring: High-carbon steel

1. Valve seat wear caused by frequent switching; 2. Corrosion of valve body in humid conditions

1. Replace valve seats periodically; 2. Keep components dry and use dehumidifiers

33

Rexroth R 431003429 2 BA-1/P54692-4

Cylinder barrel: Seamless steel; Piston rod: Chromium-plated alloy steel; Seal rings: Fluororubber (FKM); Guide sleeve: Copper-lead alloy

1. Piston rod wear due to eccentric load; 2. Seal failure caused by high pressure

1. Ensure uniform load distribution; 2. Install pressure relief valves to limit maximum pressure

1

BENDIX FLO1000229990/22990X

Brake chamber: Cast iron (HT250) with anti-rust painting; Piston: Steel with wear-resistant coating; Seal rings: Nitrile rubber (NBR) with high temperature resistance; Push rod: Chromium-plated alloy steel

1. Wear of piston and cylinder wall caused by dust and sand entering the brake chamber; 2. Seal failure due to high temperature generated during long-time braking

1. Install dust-proof covers on brake chamber ports and clean regularly; 2. Avoid continuous long-time braking, use auxiliary braking systems during downhill, and inspect brake temperature (≤250℃)

2

BENDIX AD-2IA592

Air dryer core: Molecular sieve with high water absorption; Housing: Aluminum alloy with electrophoresis coating; Valve body: Brass; Seal rings: Fluororubber (FKM)

1. Reduced water absorption capacity of dryer core due to oil contamination in compressed air; 2. Corrosion of housing caused by salt spray in coastal areas

1. Install an oil-water separator in front of the air dryer and replace it regularly; 2. Apply anti-corrosion coating to the housing in coastal areas and inspect monthly

3

BENDIX 275491D-2

Brake valve body: Forged brass; Valve core: Steel with chrome plating; Spring: Stainless steel 304; Seal rings: Polyurethane (PU)

1. Valve core jamming caused by moisture and dust in compressed air; 2. Spring fatigue due to frequent braking operations

1. Maintain the air compression system clean and dry, drain water from the air tank daily; 2. Inspect spring elasticity quarterly and replace if deformation occurs

1

1205-001

Main body: Carbon steel Q235 with galvanizing treatment; Threads: High-precision rolled threads; Seal gaskets: Asbestos-free rubber composite; Fasteners: High-strength carbon steel

1. Thread wear caused by improper installation torque; 2. Corrosion of main body due to rainwater and oilfield chemicals

1. Use torque wrenches for installation according to the specified torque range; 2. Apply anti-corrosion grease to threads and use waterproof gaskets in outdoor installations