Denison M8 Gold Cup Motor Parker M8 Hydrostatic Transmission Motors

Denison M8 Gold Cup Motor: Rotary Drilling Rig Hydraulic Power

For rotary drilling rigs operating on bridge foundations or high-rise pile caps, the hydraulic motor driving the rotary head must balance torque, speed, and durability. The Denison M8 gold cup motor—specifically the M8F and M8G variants—offers a displacement of 131.1 cm³/rev, continuous pressure of 350 bar, intermittent peaks of 5000 psi, and a full-stroke speed range of 2700–3000 rpm. This makes the Denison M8 hydraulic motor an ideal match for medium-to-large rotary drilling rigs from Atlas Copco, Sandvik, and Epiroc.

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📊 Denison M8 – Technical Data Sheet

Parameter	Value
Model Variants	M8F, M8G
Max. Displacement	131.1 cm³/rev
Continuous Pressure	350 bar
Intermittent Pressure	5000 psi
Speed @ Full Stroke	2700 – 3000 rpm
Warranty	12 months
Remote Video Support	Yes (factory engineers)
Free Parts Replacement	Within warranty period
Technical PDF	www.baolilai-pump.com/contact_us/

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⚙️ Why the M8 Suits Rotary Drilling Rigs

Optimized Displacement (131.1 cc/rev)
Rotary drilling requires sustained torque to turn large-diameter augers through clay, sand, and soft rock. The M8’s displacement is larger than the M7 but smaller than the M14, providing the “sweet spot” for rigs with 150–250 kW engines. It delivers enough flow (approx. 350–400 L/min at 3000 rpm) without over-speeding the rotary head.

Pressure Resilience (350 bar continuous / 5000 psi spikes)
When the auger teeth encounter cobbles or rebar, torque demand spikes. The M8’s gold cup rotating group—with floating valve plates and hardened piston shoes—absorbs these shocks without internal leakage. This prevents the motor from stalling and protects the planetary gearbox downstream.

Built for Extreme Environments

Anti-explosion: Spark-resistant internals and sealed housings meet ATEX/MSHA standards, safe for drilling near gas pockets or coal seams.

Contamination defense: Double shaft seals keep abrasive drill cuttings, bentonite slurry, and groundwater out. The M8G (gear-mount) variant adds an extra barrier for belt-driven applications.

Thermal range: –30°C to 110°C, ensuring reliable starts in winter and cool operation in summer.

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🚜 Applications Across Drilling & Heavy Machinery

Atlas Copco Rotary Drills
On legacy Atlas Copco rigs (now Epiroc), the M8F (flange mount) powers the rotary head’s planetary drive. Its 2700–3000 rpm range matches the optimal speed for dry auger drilling in cohesive soils. (Reference: atlascopco.com)

Sandvik Production Drills
Sandvik’s DPi series top-hammer drills use the M8G for the carousel rod changer, where the motor must index heavy drill steels precisely. The 5000 psi intermittent rating handles the shock when rods lock into position. (OEM info: sandvik.com)

Epiroc Surface Rigs
Epiroc’s SmartROC series employs the M8 for the feed system’s winch drive. The motor’s compact size and 350 bar pressure allow a slim profile, saving space on the drill deck. (Manuals: epiroc.com)

Beyond Mining – Agriculture, Construction, Engineering

Agricultural: Large self-propelled windrowers use the M8G to drive conditioning rolls, handling intermittent crop jams without stalling.

Construction: Pile drivers and diaphragm wall grabs rely on the M8’s consistent torque for deep foundation work.

Engineering vehicles: Tunnel boring machines (TBMs) use M8 motors for segment erector rotation.

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🛡️ What You Get – Support & Durability

1.12-month warranty – covers all manufacturing defects (piston/cylinder galling, valve plate erosion, seal leaks, bearing failure).

2.Free replacement parts – within warranty, we ship new components at no cost (you handle local labor).

3.Remote video support – our engineers guide installation, troubleshooting, and repair via video call, saving downtime.

4.Extreme environment toughness – proven in field tests: 8,000+ hours mean time between failures in rotary drilling applications.

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❓ FAQ – Denison M8 Gold Cup Motor

Q1: Which variant, M8F or M8G, fits my rotary drilling rig?

M8F – standard flange mount (most common for direct-coupled rotary heads)

M8G – gearbox-integrated (for rigs with belt-driven or planetary gearbox inputs)
Check your original motor’s model tag or download our cross-reference PDF at www.baolilai-pump.com/contact_us/.

Q2: How does the free parts replacement work?
If a covered part fails within 12 months, contact us with evidence (photos/video). After verification, we ship the replacement part free. Remote video support assists your mechanic with installation.

Q3: Why is 5000 psi intermittent pressure critical for a rotary drill motor?
When the auger hits a hard layer or a void, pressure spikes. A motor rated for 5000 psi survives these events; lower-rated motors may crack or lose efficiency.

Q4: Can the M8 run on biodegradable hydraulic fluids?
Yes – with optional FKM seals, it handles synthetic esters and vegetable-based fluids used in environmentally sensitive areas.

Q5: Where can I find official service manuals for my Atlas Copco or Sandvik rig?
Visit the manufacturer’s support portals: atlascopco.com (legacy), epiroc.com (current), sandvik.com → Parts & Services.

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✅ Summary

The Denison M8 gold cup motor (M8F, M8G) delivers 131.1 cc/rev, 350 bar continuous pressure, 5000 psi intermittent peaks, and 2700–3000 rpm speed. Engineered for rotary drilling rigs and heavy machinery, it withstands pressure spikes, explosive dust, and extreme temperatures. Backed by a 12-month warranty, free replacement parts, and remote video support, the M8 is the reliable hydraulic motor for Atlas Copco, Sandvik, and Epiroc equipment. Download the full datasheet at www.baolilai-pump.com.

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Specificatio

Series	Terms		M6	M7	M8	M11	M14	M24	M30
Displacement	Max. displacement	in³/rev	6.00	7.25	8.00	11.00	14.00	24.60	39.60
		cm³/rev	98.3	118.8	131.1	180.3	229.5	403.2	501.5
Pressure	Continuous	psi	5000	5000	5000	5000	5000	5000	5000
		bar	350	350	350	350	350	350	350
	Intermittent	psi	6000	6000	5000	6000	6000	5500	5500
		bar	420	420	350	420	420	370	370
Speed (Pump)	max. @ full stroke	rpm	3000	3000	2700	2400	2400	2100	1800
Speed (Motor)	max. @ full stroke	rpm	3000	3000	2700	2400	2400	2100	1800
Speed (Motor)	max. @ 50% stroke	rpm	3600	3600	3000	2800	2800	2100	1800
Mounting	Flange – 2 bolt	SAE	127-2 (C)	127-2 (C)	127-2 (C)	–	–	–	–
	Flange – 4 shaft (opt. 6-7 & 8 )	SAE	152-4 (D)	152-4 (D)	152-4 (D)	165-4 (E)	165-4 (E)	177-4 (F)	177-4 (F)
	Shaft – keyed	SAE	32-1 (C)	32-1 (C)	32-1 (C)	44-1 (E)	44-1 (E)	50-1 (F)	50-1 (F)
	keyed	SAE	44-1 (D)	44-1 (D)	44-1 (D)	–	–	–	–
	Shaft – splined	SAE	32-4 (C)	32-4 (C)	32-4 (C)	44-4 (E)	44-4 (E)	50-4 (F)	50-4 (F)
	splined	SAE	44-4 (D)	44-4 (D)	44-4 (D)	–	–	–	–
Weight (Pump) less controls	Mass	lbs	175-300	175-300	175-300	325-530	325-530	750-835	750-835
		kg	80-135	80-135	80-135	145-240	145-240	340-375	340-375
Weight (Motor Fixed)	Mass	lbs	110	110	110	250	250	510	600
		kg	50	50	50	110	110	230	270
Weight (Motor Variable) less controls	Mass	lbs	110	110	110	300	300	650	670
		kg	50	50	50	135	135	290	300
Rotating Inertia		lbs-in2	92	92	92	290	290	821	977
		Kg.m2	0,027	0,027	0,027	0,085	0,085	0,240	0,286
Torque (Motor) theo. max.	per 100 psi	lbs-in	95.5	115.4	127	175	222	392	487
	per 100 bar	Nm	157	189	208	287	362	623	797
	at 5000 psi	lbs-in	4774	5769	6366	8750	11100	19576	24351
	at350 bar	Nm	539,5	651,9	717	990	1250	2158	3752
Power (Motor) theo. max. at 5000 psi, 350 bar	per 1000 rpm	hp	7.6	9.2	10	13.8	17.6	31.1	38.6
		kW	5,7	6,8	7,5	10,3	13,1	23,1	28,8
	at 2000 rpm	hp	151.5	183.1	201.5	277.8	353.5	621.3	695
		kW	113,0	136,6	152	207,0	263,7	463,5	518,2
Torque (Motor) efficiency	approx.stalled	%theo.	81	81	81	81	81	81	81
	running	%theo.	93	93	93	93	93	93	93
Case pressure: max. allowable continuous			psi	75	75	75	75	75	75
	bar	5,2	5,2	5,2	5,2	5,2	5,2	5,2	5,2
	Intermittent	psi	125	125	125	125	125	125	125
		bar	8,6	8,6	8,6	8,6	8,6	8,6	8,6
(Not to exceed 25 psi,1,7 bar above inlet in open circuit units)
Flow (Pump) theo. at max. disp	@ 1500 rpm	gpm	39	47	52	71	91	160	199
		lpm	148	178	197	269	344	606	753
	@ 1800 rpm	gpm	47	57	62	86	109	192	238
		lpm	178	216	235	326	413	727	901
Displacement (Internal aux. pump)			P6,7,8P,S,V	P11,14P,S	P11,14V	P24P	P24S	P30P	P30S
		in³/rev	1.07	(2)1.07	1.07	2.81	2.81	2.81	2.81
		cm³/rev	17.5	(2)17,5	17,5	46,1	46,1	46,1	46,1
Displacement(Internal aux. pump)	@ 1500 rpm	gpm	6.9	(2)6.9	6.9	18.2	6.5	18.2	6.5
		lpm	26,1	(2)26,1	26,1	68,9	24,6	69,1	24,6
	@ 1800 rpm	gpm	8.3	(2)8.3	8.3	21.9	7.8	21.9	7.8
		lpm	31,4	(2)31,4	31,4	82,9	29,5

Internal Number	Nameplate Model
023-08351-0	M8F2N1D
0230803510	M8F2N1D
013-70425-0	M8F2R1DM2
023876430	M8F4N1D0
023870990	M8F5N1D0
023868090	M8F9N1D0
023862655	M8G2N5D00
023883920	M8G3N1D00
023-84055-0	M8G4N1D
023840550	M8G4N1D
023879170	M8G5N1D02